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-This is librejs.info, produced by makeinfo version 6.8 from
-librejs.texi.
-
-This manual is for GNU LibreJS (version 7.20, 28 April 2022), a GNU
-IceCat extension to detect and block nonfree nontrivial JavaScript on
-webpages.
-
- Copyright (C) 2011 2012 2014 2015 Loic J. Duros, 2022 Yuchen Pei
-
- Permission is granted to copy, distribute and/or modify this
- document under the terms of the GNU Free Documentation License,
- Version 1.3 or any later version published by the Free Software
- Foundation; with no Invariant Sections, with no Front-Cover
- Texts, and with no Back-Cover Texts. A copy of the license is
- included in the section entitled "GNU Free Documentation
- License".
-INFO-DIR-SECTION GNUzilla
-START-INFO-DIR-ENTRY
-* LibreJS: (librejs). Detect nonfree nontrivial in GNU Icecat
-END-INFO-DIR-ENTRY
-
-
-File: librejs.info, Node: Top, Next: Overview, Up: (dir)
-
-LibreJS
-*******
-
-This manual is for GNU LibreJS (version 7.20, 28 April 2022).
-
-* Menu:
-
-* Overview:: General purpose and information.
-* Disclaimer:: Emphasize what LibreJS does and does not.
-* Installation:: Installing LibreJS from source.
-* How to Use:: How to use LibreJS in IceCat.
-* JavaScript Detection:: How LibreJS detects nontrivial Javascript.
-* Free Licenses Detection:: List of licenses detected by LibreJS.
-* Setting Your JavaScript Free:: Information for website owners/maintainers.
-* LibreJS Development Notes:: Documentation about the development of
- LibreJS itself.
-* Installation Requirements:: Requirements to build and install LibreJS.
-* LibreJS Internals:: How LibreJS works under the hood.
-* GNU Free Documentation License:: Copying and sharing this documentation.
-
-
-
-
-
-
-
-
-
-File: librejs.info, Node: Overview, Next: Disclaimer, Prev: Top, Up: Top
-
-1 Overview
-**********
-
-GNU LibreJS --an add-on for GNU IceCat and Mozilla Firefox-- detects
-and blocks nonfree nontrivial JavaScript while allowing its execution
-on pages containing code that is either trivial and/or free.
-
- Many websites run nontrivial JavaScript on your computer. Some use
-it for complex tasks; many use it gratuitously for minor jobs that
-could be done easily with plain HTML. Sometimes this JavaScript code
-is malicious. Either way, the JavaScript code is often nonfree. For
-explanation of the issue, see "The JavaScript
-Trap"(<http://www.gnu.org/philosophy/javascript-trap.html>).
-
- If you care about freedom in your computing, and don't wish to let
-all and sundry make you run nonfree programs, now you can prevent it
-by using LibreJS.
-
-
-File: librejs.info, Node: Disclaimer, Next: Installation, Prev: Overview, Up: Top
-
-2 Disclaimer
-************
-
- * LibreJS is not a security tool. Its goal is to detect nonfree
- nontrivial JavaScript, and it currently does not detect whether
- free or trivial code is malicious or not. Other free Mozilla
- extensions and add-ons may be available for this purpose.
-
- * LibreJS is always a work in progress. If you find a bug, please
- report it to <bug-librejs@gnu.org>.
-
-
-File: librejs.info, Node: Installation, Next: How to Use, Prev: Disclaimer, Up: Top
-
-3 Installation
-**************
-
-You can install LibreJS directly using a generated 'librejs.xpi' file,
-or by building it from source (*Note LibreJS Development Notes::).
-
- You can also download it from
-<https://www.gnu.org/software/librejs/> or
-<https://addons.mozilla.org/addon/librejs/>, but due to Mozilla's
-review process the download isn't always up to date.
-
-
-File: librejs.info, Node: How to Use, Next: JavaScript Detection, Prev: Installation, Up: Top
-
-4 How to Use
-************
-
-4.1 LibreJS in action
-=====================
-
-After installing the add-on, you will see the LibreJS widget in the
-add-on bar at the top right of the browser window. After loading a
-page, left-click on the widget to view the deactivated JavaScript code
-from the page (both on page and external) and, if applicable, the
-scripts that were accepted.
-
-4.2 Script Blacklist/whitelist
-==============================
-
-Scripts may be blacklisted or whitelisted through the pop-up menu box.
-
- Whitelisted scripts will always be accepted and blacklisted scripts
-will always get rejected.
-
- It is important to note that this feature recognizes which scripts
-are blacklisted and whitelisted based on hash. This means that even a
-slight difference in a script's code will cause it to be recognized as
-a separate script.
-
- Sometimes, JavaScript will be dynamically generated so that it is
-different every time a website is loaded. These types of scripts
-cannot be whitelisted or blacklisted since they cannot be recognized.
-
- LibreJS has a default whitelist of scripts that are known to be
-free but may not declare their license in a format that LibreJS can
-understand.
-
-4.3 Complaint Feature
-=====================
-
-It is very important to complain when a site has nonfree JavaScript
-code, especially if it won't work without that code. LibreJS makes it
-easy to complain by heuristically finding where to send the complaint.
-
- When nonfree/nontrivial code is detected in a page, LibreJS
-attempts to find a relevant contact link or email for the website you
-are visiting. In order to do so, it will attempt to visit a few links
-from the current page (for instance, a link labeled "contact" on the
-same domain as the current page, ...)
-
- LibreJS detects contact pages, email addresses that are likely to
-be owned by the maintainer of the site, Twitter and identi.ca links,
-and phone numbers.
-
- When you complain to the website for their nonfree nontrivial
-JavaScript, provide them with the link to the JavaScript Trap essay so
-that they can get more information on what the issue is and how they
-can solve it on their own site.
-
- LibreJS includes a default subject line and body for the complaint
-email, with a link to the JavaScript Trap essay. This can be
-configured in the LibreJS add-on preferences in your web browser.
-
-4.4 Options
-===========
-
- You can manage LibreJS's preferences either from the extension's
- entry in your browser's Add-ons Manager page ('about:addons') or
- by clicking the LibreJS toolbar icon and then the "Settings..."
- button on the top right of the popup. This will open a panel
- containing a whitelist/blacklist manager and a section to
- configure your complaints messages to site owners.
-
-"Whitelist/Blacklist"
-
- LibreJS lets you whitelist or blacklist domain names and
- subdomains, to bypass the regular JavaScript checks. This might
- be useful, for example, if you are running your own code in a
- local web server, or if you don't want to waste computing
- resources on script origins you already know you can't trust.
- librejs provides a lists manager UI to handle both the lists on
- the top of its Options panel.
-
-"Complaint email subject"
- Configure the default subject used in complaint emails.
-
-"Complaint email body"
- Configure the default body used in complaint emails.
-
-
-File: librejs.info, Node: JavaScript Detection, Next: Free Licenses Detection, Prev: How to Use, Up: Top
-
-5 JavaScript Detection
-**********************
-
-LibreJS considers a very strict subset of JavaScript to be acceptable
-for use in non-free scripts. This is meant to maximimize
-compatibility with websites that haven't tried to be LibreJS
-compatible.
-
- We consider modification of the document non-trivial. There isn't
-much that javascript could do that we would consider trivial, for
-anything else a free software license would be required.
-
- The criterion is as follows:
-
- For each function definition:
- * It must call only primitives.
- * The number of conditionals and loops must be at most 3.
- * It does not declare an array more than 50 elements long.
- * It must not call itself
-
- For the rest of the script, outside of function definitions:
- * It must call only primitives and functions defined above in the
- page.
- * The number of conditionals and loops must be at most 3.
-
- "function" means anything executable that gets a name, including
-methods.
-
- Allowed primitives exclude:
- * eval()
- * ajax
- * calling methods with the square bracket notation
- * altering the dom
- * most other items found as methods of the '.window' object.
-
-
-File: librejs.info, Node: Free Licenses Detection, Next: Setting Your JavaScript Free, Prev: JavaScript Detection, Up: Top
-
-6 Free Licenses Detection
-*************************
-
-The machine readable format for license declarations that LibreJS uses
-has changed in the most recent version. This was necessary in order
-to not break the asynchronous JS loading model that browsers use.
-Scripts are now evaluated independent of eachother and strictly as
-they arrive.
-
-
-File: librejs.info, Node: Setting Your JavaScript Free, Next: LibreJS Development Notes, Prev: Free Licenses Detection, Up: Top
-
-7 Setting Your JavaScript Free
-******************************
-
-The first step is releasing your JavaScript under a free license. If
-you are already using a free library, or you're not using any
-third-party libraries, it might only take a few minutes.
-
- On your website, take a look at your HTML source. You can identify
-distinct pieces of JavaScript that might be free and some other that
-are nonfree.
-
- This might be the case with an analytics tracker, social media
-widgets, and code that runs ads. Removing these pieces of code from
-your site is required to have the rest accepted as free. There are
-often alternatives to nonfree libraries or to third-party services:
-
- * If you have used nonfree third-party code as the base to write
- your own code, try to find a free alternative.
-
- * If you're using a third-party service such as an analytics
- service, replace it with a free alternative like Matomo.
-
- * If you can't find free JavaScript that has already been
- developed, write it yourself! Who knows, your own solution might
- be the start of a brilliant project!
-
-7.1 License tags
-================
-
-LibreJS will allow non-trivial scripts to run as long as they use a
-free license.
-
- In order for the license of a script to be recognized by LibreJS,
-it must be declared using a machine-readable license format.
-
- This format is the same for both remote in-line scripts.
-
- "// @license [magnet link] [identifier]" [Script here] "//
-@license-end"
-
- "Identifier" is a name of a license from the following list and the
-magnet link in the 'canonicalUrl' field is that license's exact
-corresponding magnet link.
-
-{
- 'AGPL-3.0': {
- licenseName: 'GNU AFFERO GENERAL PUBLIC LICENSE version 3',
- identifier: 'AGPL-3.0',
- canonicalUrl: [
- 'http://www.gnu.org/licenses/agpl-3.0.html',
- 'magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt'
- ],
-
- },
-
- 'Apache-2.0': {
- licenseName: 'Apache License, Version 2.0',
- identifier: 'Apache-2.0',
- canonicalUrl: [
- 'http://www.apache.org/licenses/LICENSE-2.0',
- 'magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt'
- ],
- },
-
- 'Artistic-2.0': {
- licenseName: "Artistic License 2.0",
- identifier: 'Artistic-2.0',
- canonicalUrl: [
- "http://www.perlfoundation.org/artistic_license_2_0",
- "magnet:?xt=urn:btih:54fd2283f9dbdf29466d2df1a98bf8f65cafe314&dn=artistic-2.0.txt"
- ],
- },
-
- 'BSD-2-Clause': {
- licenseName: "BSD 2-Clause License",
- identifier: 'BSD-2-Clause',
- canonicalUrl: [
- 'http://www.freebsd.org/copyright/freebsd-license.html',
- 'magnet:?xt=urn:btih:87f119ba0b429ba17a44b4bffcab33165ebdacc0&dn=freebsd.txt'
- ],
- },
-
- 'BSD-3-Clause': {
- licenseName: "BSD 3-Clause License",
- identifier: 'BSD-3-Clause',
- canonicalUrl: [
- 'http://opensource.org/licenses/BSD-3-Clause',
- 'magnet:?xt=urn:btih:c80d50af7d3db9be66a4d0a86db0286e4fd33292&dn=bsd-3-clause.txt'
- ],
- },
-
- 'BSL-1.0': {
- licenseName: 'Boost Software License 1.0',
- identifier: 'BSL-1.0',
- canonicalUrl: [
- 'http://www.boost.org/LICENSE_1_0.txt',
- 'magnet:?xt=urn:btih:89a97c535628232f2f3888c2b7b8ffd4c078cec0&dn=Boost-1.0.txt'
- ],
- },
-
- 'CC-BY-1.0': {
- licenseName: 'Creative Commons Attribution 1.0 Generic',
- identifier: 'CC-BY-1.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by/1.0/'],
- },
-
- 'CC-BY-2.0': {
- licenseName: 'Creative Commons Attribution 2.0 Generic',
- identifier: 'CC-BY-2.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by/2.0/'],
- },
-
- 'CC-BY-2.5': {
- licenseName: 'Creative Commons Attribution 2.5 Generic',
- identifier: 'CC-BY-2.5',
- canonicalUrl: ['https://creativecommons.org/licenses/by/2.5/'],
- },
-
- 'CC-BY-3.0': {
- licenseName: 'Creative Commons Attribution 3.0 Unported',
- identifier: 'CC-BY-3.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by/3.0/'],
- },
-
- 'CC-BY-4.0': {
- licenseName: 'Creative Commons Attribution 4.0 International',
- identifier: 'CC-BY-4.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by/4.0/'],
- },
-
- 'CC-BY-SA-1.0': {
- licenseName: 'Creative Commons Attribution-ShareAlike 1.0 Generic',
- identifier: 'CC-BY-SA-1.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by-sa/1.0/'],
- },
-
- 'CC-BY-SA-2.0': {
- licenseName: 'Creative Commons Attribution-ShareAlike 2.0 Generic',
- identifier: 'CC-BY-SA-2.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by-sa/2.0/'],
- },
-
- 'CC-BY-SA-2.5': {
- licenseName: 'Creative Commons Attribution-ShareAlike 2.5 Generic',
- identifier: 'CC-BY-SA-2.5',
- canonicalUrl: ['https://creativecommons.org/licenses/by-sa/2.5/'],
- },
-
- 'CC-BY-SA-3.0': {
- licenseName: 'Creative Commons Attribution-ShareAlike 3.0 Unported',
- identifier: 'CC-BY-SA-3.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by-sa/3.0/'],
- },
-
- 'CC-BY-SA-4.0': {
- licenseName: 'Creative Commons Attribution-ShareAlike 4.0 International',
- identifier: 'CC-BY-SA-4.0',
- canonicalUrl: ['https://creativecommons.org/licenses/by-sa/4.0/'],
- },
-
- 'CC0-1.0': {
- licenseName: 'Creative Commons CC0 1.0 Universal',
- identifier: 'CC0-1.0',
- canonicalUrl: [
- 'http://creativecommons.org/publicdomain/zero/1.0/legalcode',
- 'magnet:?xt=urn:btih:90dc5c0be029de84e523b9b3922520e79e0e6f08&dn=cc0.txt'
- ],
- },
-
- 'CPAL-1.0': {
- licenseName: 'Common Public Attribution License Version 1.0 (CPAL)',
- identifier: 'CPAL-1.0',
- canonicalUrl: [
- 'http://opensource.org/licenses/cpal_1.0',
- 'magnet:?xt=urn:btih:84143bc45939fc8fa42921d619a95462c2031c5c&dn=cpal-1.0.txt'
- ],
- },
-
- 'EPL-1.0': {
- licenseName: "Eclipse Public License Version 1.0",
- identifier: "EPL-1.0",
- canonicalUrl: [
- "http://www.eclipse.org/legal/epl-v10.html",
- "magnet:?xt=urn:btih:4c6a2ad0018cd461e9b0fc44e1b340d2c1828b22&dn=epl-1.0.txt"
- ],
- },
-
- 'Expat': {
- licenseName: 'Expat License (sometimes called MIT Licensed)',
- identifier: 'Expat',
- canonicalUrl: [
- 'http://www.jclark.com/xml/copying.txt',
- 'magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt'
- ],
- },
-
- 'FreeBSD': {
- licenseName: "FreeBSD License",
- identifier: 'FreeBSD',
- canonicalUrl: [
- 'http://www.freebsd.org/copyright/freebsd-license.html',
- 'magnet:?xt=urn:btih:87f119ba0b429ba17a44b4bffcab33165ebdacc0&dn=freebsd.txt'
- ],
- },
-
- 'GNU-All-Permissive': {
- licenseName: 'GNU All-Permissive License',
- identifier: 'GNU-All-Permissive',
- canonicalUrl: [],
- },
-
- 'GPL-2.0': {
- licenseName: 'GNU General Public License (GPL) version 2',
- identifier: 'GPL-2.0',
- canonicalUrl: [
- 'http://www.gnu.org/licenses/gpl-2.0.html',
- 'magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt'
- ],
- },
-
- 'GPL-3.0': {
- licenseName: 'GNU General Public License (GPL) version 3',
- identifier: 'GPL-3.0',
- canonicalUrl: [
- 'http://www.gnu.org/licenses/gpl-3.0.html',
- 'magnet:?xt=urn:btih:1f739d935676111cfff4b4693e3816e664797050&dn=gpl-3.0.txt'
- ],
- },
-
- 'ISC': {
- licenseName: "The ISC License",
- identifier: 'ISC',
- canonicalUrl: [
- 'https://www.isc.org/downloads/software-support-policy/isc-license/',
- 'magnet:?xt=urn:btih:b8999bbaf509c08d127678643c515b9ab0836bae&dn=ISC.txt'
- ],
- },
-
- 'jQueryTools': {
- licenseName: "jQuery Tools",
- identifier: 'jQueryTools',
- canonicalUrl: [],
- },
-
- 'LGPL-2.1': {
- licenseName: 'GNU Lesser General Public License, version 2.1',
- identifier: 'LGPL-2.1',
- canonicalUrl: [
- 'http://www.gnu.org/licenses/lgpl-2.1.html',
- 'magnet:?xt=urn:btih:5de60da917303dbfad4f93fb1b985ced5a89eac2&dn=lgpl-2.1.txt'
- ],
- },
-
- 'LGPL-3.0': {
- licenseName: 'GNU Lesser General Public License, version 3',
- identifier: 'LGPL-3.0',
- canonicalUrl: [
- 'http://www.gnu.org/licenses/lgpl-3.0.html',
- 'magnet:?xt=urn:btih:0ef1b8170b3b615170ff270def6427c317705f85&dn=lgpl-3.0.txt'
- ],
- },
-
- 'MPL-2.0': {
- licenseName: 'Mozilla Public License Version 2.0',
- identifier: 'MPL-2.0',
- canonicalUrl: [
- 'http://www.mozilla.org/MPL/2.0',
- 'magnet:?xt=urn:btih:3877d6d54b3accd4bc32f8a48bf32ebc0901502a&dn=mpl-2.0.txt'
- ],
- },
-
- 'PublicDomain': {
- licenseName: 'Public Domain',
- identifier: 'PublicDomain',
- canonicalUrl: [
- 'magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt'
- ],
- },
-
-
- 'Unlicense': {
- licenseName: 'Unlicense',
- identifier: 'Unlicense',
- canonicalUrl: [
- 'http://unlicense.org/UNLICENSE',
- 'magnet:?xt=urn:btih:5ac446d35272cc2e4e85e4325b146d0b7ca8f50c&dn=unlicense.txt'
- ],
- },
-
- 'UPL': {
- licenseName: 'Universal Permissive License',
- identifier: 'UPL-1.0',
- canonicalUrl: [
- 'https://oss.oracle.com/licenses/upl/',
- 'magnet:?xt=urn:btih:478974f4d41c3fa84c4befba25f283527fad107d&dn=upl-1.0.txt'
- ],
- },
-
- 'WTFPL': {
- licenseName: 'Do What The F*ck You Want To Public License (WTFPL)',
- identifier: 'WTFPL',
- canonicalUrl: [
- 'http://www.wtfpl.net/txt/copying/',
- 'magnet:?xt=urn:btih:723febf9f6185544f57f0660a41489c7d6b4931b&dn=wtfpl.txt'
- ],
- },
-
- 'X11': {
- licenseName: 'X11 License',
- identifier: 'X11',
- canonicalUrl: [
- 'magnet:?xt=urn:btih:5305d91886084f776adcf57509a648432709a7c7&dn=x11.txt'
- ],
- },
-
- 'XFree86-1.1': {
- licenseName: "XFree86 1.1 License",
- identifier: 'XFree86-1.1',
- canonicalUrl: [
- 'http://www.xfree86.org/3.3.6/COPYRIGHT2.html#3',
- 'http://www.xfree86.org/current/LICENSE4.html',
- 'magnet:?xt=urn:btih:12f2ec9e8de2a3b0002a33d518d6010cc8ab2ae9&dn=xfree86.txt'
- ],
- },
-}
-
-7.2 Undetected Free Licenses
-============================
-
-If you are using a free license that isn't detected by LibreJS and
-isn't listed in the previous section, please send a message to
-<bug-librejs@gnu.org> regarding this license, where code released
-under this license can be found, and where to find the license text
-and information.
-
- Many free licenses are listed in this page:
-<http://www.gnu.org/licenses/license-list.html>
-
-7.3 Known limitations
-=====================
-
-Service workers may cause false positives and false negatives, and
-there are multiple ways to disable them. The cleanest way is by
-setting 'dom.serviceWorkers.enabled' to 'false' in the 'about:config'
-page of your browser.
-
-
-File: librejs.info, Node: LibreJS Development Notes, Next: Installation Requirements, Prev: Setting Your JavaScript Free, Up: Top
-
-8 LibreJS Development Notes
-***************************
-
-8.1 Dependencies
-================
-
-LibreJS 7.20 depends on a number of Node.js-based libraries that can
-be installed using the 'npm' utility:
-
- $ npm install acorn-loose jassha browserify
- $ export PATH=$PATH:./node_modules/.bin
-
-8.2 Building
-============
-
-To build the extension run:
- $ browserify main_background.js -o bundle.js
-
- To build the extension plus create a .xpi package run:
- $ ./build.sh
-
- To build the extension including the automated test suite (see TEST
-below) run:
- $ ./build.sh -t
- or
- $ ./build.sh --test
-
- Note: this 'build.sh' script relies on no new source files being
-created.
-
-8.3 Debugging
-=============
-
-To debug LibreJS, visit the special URL 'about:debugging'. Click on
-'Enable add-on debugging' then 'Load Temporary Add-on'. Navigate to
-LibreJS's unpacked source directory and select 'manifest.json'.
-
- Lines 39 and 40 in 'main_background.js' assign two variables
-controlling the verbosity of 'dbg_print()' statements. Make sure
-these are set to false before building a release.
-
-8.4 Testing
-===========
-
-An automated test suite runs automatically in its own tab whenever the
-extension is loaded as a "Temporary add-on" from 'about:debugging'.
-Otherwise (if included in the xpi) it can be launched from the UI by
-clicking the "Automated self test..." button.
-
-8.5 Headless testing
-====================
-
-To launch the test suite from the command line, ensure the xpi package
-has been built with automated test suite. Then install
-selenium-webdriver and geckodriver, and ensure the latter is in $PATH:
- $ npm install selenium-webdriver geckodriver
- $ export PATH=$PATH:./node_modules/.bin
-
- Now you can invoke the test with
- $ node ./test.js
-
- which will print out a summary of test results.
-
- Optionally you can also test with a chosen seed
- $ node ./test.js 12345
-
-8.6 Headless compliance check
-=============================
-
-To check whether a webpage is LibreJS-compliant from the command line,
-ensure that the xpi package has been built WITHOUT the automated test
-suite. Then install selenium-webdriver and geckodriver, and ensure
-the latter is in $PATH:
- $ npm install selenium-webdriver
- $ npm install geckodriver
- $ export PATH=$PATH:./node_modules/.bin
-
- Now you can check a webpage for compliance with
- $ node ./compliance.js <url>
-
- It will open the url in a headless browser, save a screenshot, and
-output the compliance check result.
-
- For example, to check the compliance of the FSF homepage, do
- $ node ./compliance.js https://fsf.org
-
-8.7 Adding new whitelisted libraries
-====================================
-
-The script index.js in './hash_script' generates the default
-whitelist. Run it with the following command:
-
- 'node index.js > output'
-
- Then, just copy the contents of the file "output" to the
-appropriate place in main_background.js.
-
-8.8 Releasing a new version
-===========================
-
-Update the version number in manifest.json.
-
- Make sure debug statements are set to false on lines 39/40 in
-'main_background.js'.
-
- Then run the build script 'build.sh'.
-
-
-File: librejs.info, Node: Installation Requirements, Next: LibreJS Internals, Prev: LibreJS Development Notes, Up: Top
-
-Appendix A Installation Requirements
-************************************
-
-A.1 Mozilla Browser
-===================
-
-You will need one of the many flavors of the Mozilla browser to use
-LibreJS. It can be installed on the following:
-
- GNU IceCat, Mozilla Firefox, Trisquel Abrowser, Debian Iceweasel.
-
- LibreJS works on these browsers starting from version 60. We
-recommend that you use the latest version of your Mozilla browser.
-LibreJS has been tested on a GNU/Linux distribution, but it is
-compatible any operating system as long as you're using a compatible
-Mozilla browser.
-
-
-File: librejs.info, Node: LibreJS Internals, Next: GNU Free Documentation License, Prev: Installation Requirements, Up: Top
-
-Appendix B LibreJS Internals
-****************************
-
-LibreJS intercepts HTTP responses and rewrites their contents after
-analyzing JavaScript within them. It does not remove script nodes and
-attributes from the page, but instead "deactivates" them by replacing
-their content with a commented notice.
-
- LibreJS detects the most common cases using the HTTP response
-method described above, but in less common edge cases, or when running
-code locally, LibreJS cannot detect JavaScript during the response
-stage.
-
-
-File: librejs.info, Node: GNU Free Documentation License, Prev: LibreJS Internals, Up: Top
-
-Appendix C GNU Free Documentation License
-*****************************************
-
- Version 1.3, 3 November 2008
-
- Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
- <http://fsf.org/>
-
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
- 0. PREAMBLE
-
- The purpose of this License is to make a manual, textbook, or
- other functional and useful document "free" in the sense of
- freedom: to assure everyone the effective freedom to copy and
- redistribute it, with or without modifying it, either
- commercially or noncommercially. Secondarily, this License
- preserves for the author and publisher a way to get credit for
- their work, while not being considered responsible for
- modifications made by others.
-
- This License is a kind of "copyleft", which means that derivative
- works of the document must themselves be free in the same sense.
- It complements the GNU General Public License, which is a
- copyleft license designed for free software.
-
- We have designed this License in order to use it for manuals for
- free software, because free software needs free documentation: a
- free program should come with manuals providing the same freedoms
- that the software does. But this License is not limited to
- software manuals; it can be used for any textual work, regardless
- of subject matter or whether it is published as a printed book.
- We recommend this License principally for works whose purpose is
- instruction or reference.
-
- 1. APPLICABILITY AND DEFINITIONS
-
- This License applies to any manual or other work, in any medium,
- that contains a notice placed by the copyright holder saying it
- can be distributed under the terms of this License. Such a
- notice grants a world-wide, royalty-free license, unlimited in
- duration, to use that work under the conditions stated herein.
- The "Document", below, refers to any such manual or work. Any
- member of the public is a licensee, and is addressed as "you".
- You accept the license if you copy, modify or distribute the work
- in a way requiring permission under copyright law.
-
- A "Modified Version" of the Document means any work containing
- the Document or a portion of it, either copied verbatim, or with
- modifications and/or translated into another language.
-
- A "Secondary Section" is a named appendix or a front-matter
- section of the Document that deals exclusively with the
- relationship of the publishers or authors of the Document to the
- Document's overall subject (or to related matters) and contains
- nothing that could fall directly within that overall subject.
- (Thus, if the Document is in part a textbook of mathematics, a
- Secondary Section may not explain any mathematics.) The
- relationship could be a matter of historical connection with the
- subject or with related matters, or of legal, commercial,
- philosophical, ethical or political position regarding them.
-
- The "Invariant Sections" are certain Secondary Sections whose
- titles are designated, as being those of Invariant Sections, in
- the notice that says that the Document is released under this
- License. If a section does not fit the above definition of
- Secondary then it is not allowed to be designated as Invariant.
- The Document may contain zero Invariant Sections. If the
- Document does not identify any Invariant Sections then there are
- none.
-
- The "Cover Texts" are certain short passages of text that are
- listed, as Front-Cover Texts or Back-Cover Texts, in the notice
- that says that the Document is released under this License. A
- Front-Cover Text may be at most 5 words, and a Back-Cover Text
- may be at most 25 words.
-
- A "Transparent" copy of the Document means a machine-readable
- copy, represented in a format whose specification is available to
- the general public, that is suitable for revising the document
- straightforwardly with generic text editors or (for images
- composed of pixels) generic paint programs or (for drawings) some
- widely available drawing editor, and that is suitable for input
- to text formatters or for automatic translation to a variety of
- formats suitable for input to text formatters. A copy made in an
- otherwise Transparent file format whose markup, or absence of
- markup, has been arranged to thwart or discourage subsequent
- modification by readers is not Transparent. An image format is
- not Transparent if used for any substantial amount of text. A
- copy that is not "Transparent" is called "Opaque".
-
- Examples of suitable formats for Transparent copies include plain
- ASCII without markup, Texinfo input format, LaTeX input format,
- SGML or XML using a publicly available DTD, and
- standard-conforming simple HTML, PostScript or PDF designed for
- human modification. Examples of transparent image formats
- include PNG, XCF and JPG. Opaque formats include proprietary
- formats that can be read and edited only by proprietary word
- processors, SGML or XML for which the DTD and/or processing tools
- are not generally available, and the machine-generated HTML,
- PostScript or PDF produced by some word processors for output
- purposes only.
-
- The "Title Page" means, for a printed book, the title page
- itself, plus such following pages as are needed to hold, legibly,
- the material this License requires to appear in the title page.
- For works in formats which do not have any title page as such,
- "Title Page" means the text near the most prominent appearance of
- the work's title, preceding the beginning of the body of the
- text.
-
- The "publisher" means any person or entity that distributes
- copies of the Document to the public.
-
- A section "Entitled XYZ" means a named subunit of the Document
- whose title either is precisely XYZ or contains XYZ in
- parentheses following text that translates XYZ in another
- language. (Here XYZ stands for a specific section name mentioned
- below, such as "Acknowledgements", "Dedications", "Endorsements",
- or "History".) To "Preserve the Title" of such a section when
- you modify the Document means that it remains a section "Entitled
- XYZ" according to this definition.
-
- The Document may include Warranty Disclaimers next to the notice
- which states that this License applies to the Document. These
- Warranty Disclaimers are considered to be included by reference
- in this License, but only as regards disclaiming warranties: any
- other implication that these Warranty Disclaimers may have is
- void and has no effect on the meaning of this License.
-
- 2. VERBATIM COPYING
-
- You may copy and distribute the Document in any medium, either
- commercially or noncommercially, provided that this License, the
- copyright notices, and the license notice saying this License
- applies to the Document are reproduced in all copies, and that
- you add no other conditions whatsoever to those of this License.
- You may not use technical measures to obstruct or control the
- reading or further copying of the copies you make or distribute.
- However, you may accept compensation in exchange for copies. If
- you distribute a large enough number of copies you must also
- follow the conditions in section 3.
-
- You may also lend copies, under the same conditions stated above,
- and you may publicly display copies.
-
- 3. COPYING IN QUANTITY
-
- If you publish printed copies (or copies in media that commonly
- have printed covers) of the Document, numbering more than 100,
- and the Document's license notice requires Cover Texts, you must
- enclose the copies in covers that carry, clearly and legibly, all
- these Cover Texts: Front-Cover Texts on the front cover, and
- Back-Cover Texts on the back cover. Both covers must also
- clearly and legibly identify you as the publisher of these
- copies. The front cover must present the full title with all
- words of the title equally prominent and visible. You may add
- other material on the covers in addition. Copying with changes
- limited to the covers, as long as they preserve the title of the
- Document and satisfy these conditions, can be treated as verbatim
- copying in other respects.
-
- If the required texts for either cover are too voluminous to fit
- legibly, you should put the first ones listed (as many as fit
- reasonably) on the actual cover, and continue the rest onto
- adjacent pages.
-
- If you publish or distribute Opaque copies of the Document
- numbering more than 100, you must either include a
- machine-readable Transparent copy along with each Opaque copy, or
- state in or with each Opaque copy a computer-network location
- from which the general network-using public has access to
- download using public-standard network protocols a complete
- Transparent copy of the Document, free of added material. If you
- use the latter option, you must take reasonably prudent steps,
- when you begin distribution of Opaque copies in quantity, to
- ensure that this Transparent copy will remain thus accessible at
- the stated location until at least one year after the last time
- you distribute an Opaque copy (directly or through your agents or
- retailers) of that edition to the public.
-
- It is requested, but not required, that you contact the authors
- of the Document well before redistributing any large number of
- copies, to give them a chance to provide you with an updated
- version of the Document.
-
- 4. MODIFICATIONS
-
- You may copy and distribute a Modified Version of the Document
- under the conditions of sections 2 and 3 above, provided that you
- release the Modified Version under precisely this License, with
- the Modified Version filling the role of the Document, thus
- licensing distribution and modification of the Modified Version
- to whoever possesses a copy of it. In addition, you must do
- these things in the Modified Version:
-
- A. Use in the Title Page (and on the covers, if any) a title
- distinct from that of the Document, and from those of
- previous versions (which should, if there were any, be
- listed in the History section of the Document). You may use
- the same title as a previous version if the original
- publisher of that version gives permission.
-
- B. List on the Title Page, as authors, one or more persons or
- entities responsible for authorship of the modifications in
- the Modified Version, together with at least five of the
- principal authors of the Document (all of its principal
- authors, if it has fewer than five), unless they release you
- from this requirement.
-
- C. State on the Title page the name of the publisher of the
- Modified Version, as the publisher.
-
- D. Preserve all the copyright notices of the Document.
-
- E. Add an appropriate copyright notice for your modifications
- adjacent to the other copyright notices.
-
- F. Include, immediately after the copyright notices, a license
- notice giving the public permission to use the Modified
- Version under the terms of this License, in the form shown
- in the Addendum below.
-
- G. Preserve in that license notice the full lists of Invariant
- Sections and required Cover Texts given in the Document's
- license notice.
-
- H. Include an unaltered copy of this License.
-
- I. Preserve the section Entitled "History", Preserve its Title,
- and add to it an item stating at least the title, year, new
- authors, and publisher of the Modified Version as given on
- the Title Page. If there is no section Entitled "History"
- in the Document, create one stating the title, year,
- authors, and publisher of the Document as given on its Title
- Page, then add an item describing the Modified Version as
- stated in the previous sentence.
-
- J. Preserve the network location, if any, given in the Document
- for public access to a Transparent copy of the Document, and
- likewise the network locations given in the Document for
- previous versions it was based on. These may be placed in
- the "History" section. You may omit a network location for
- a work that was published at least four years before the
- Document itself, or if the original publisher of the version
- it refers to gives permission.
-
- K. For any section Entitled "Acknowledgements" or
- "Dedications", Preserve the Title of the section, and
- preserve in the section all the substance and tone of each
- of the contributor acknowledgements and/or dedications given
- therein.
-
- L. Preserve all the Invariant Sections of the Document,
- unaltered in their text and in their titles. Section
- numbers or the equivalent are not considered part of the
- section titles.
-
- M. Delete any section Entitled "Endorsements". Such a section
- may not be included in the Modified Version.
-
- N. Do not retitle any existing section to be Entitled
- "Endorsements" or to conflict in title with any Invariant
- Section.
-
- O. Preserve any Warranty Disclaimers.
-
- If the Modified Version includes new front-matter sections or
- appendices that qualify as Secondary Sections and contain no
- material copied from the Document, you may at your option
- designate some or all of these sections as invariant. To do
- this, add their titles to the list of Invariant Sections in the
- Modified Version's license notice. These titles must be distinct
- from any other section titles.
-
- You may add a section Entitled "Endorsements", provided it
- contains nothing but endorsements of your Modified Version by
- various parties--for example, statements of peer review or that
- the text has been approved by an organization as the
- authoritative definition of a standard.
-
- You may add a passage of up to five words as a Front-Cover Text,
- and a passage of up to 25 words as a Back-Cover Text, to the end
- of the list of Cover Texts in the Modified Version. Only one
- passage of Front-Cover Text and one of Back-Cover Text may be
- added by (or through arrangements made by) any one entity. If
- the Document already includes a cover text for the same cover,
- previously added by you or by arrangement made by the same entity
- you are acting on behalf of, you may not add another; but you may
- replace the old one, on explicit permission from the previous
- publisher that added the old one.
-
- The author(s) and publisher(s) of the Document do not by this
- License give permission to use their names for publicity for or
- to assert or imply endorsement of any Modified Version.
-
- 5. COMBINING DOCUMENTS
-
- You may combine the Document with other documents released under
- this License, under the terms defined in section 4 above for
- modified versions, provided that you include in the combination
- all of the Invariant Sections of all of the original documents,
- unmodified, and list them all as Invariant Sections of your
- combined work in its license notice, and that you preserve all
- their Warranty Disclaimers.
-
- The combined work need only contain one copy of this License, and
- multiple identical Invariant Sections may be replaced with a
- single copy. If there are multiple Invariant Sections with the
- same name but different contents, make the title of each such
- section unique by adding at the end of it, in parentheses, the
- name of the original author or publisher of that section if
- known, or else a unique number. Make the same adjustment to the
- section titles in the list of Invariant Sections in the license
- notice of the combined work.
-
- In the combination, you must combine any sections Entitled
- "History" in the various original documents, forming one section
- Entitled "History"; likewise combine any sections Entitled
- "Acknowledgements", and any sections Entitled "Dedications". You
- must delete all sections Entitled "Endorsements."
-
- 6. COLLECTIONS OF DOCUMENTS
-
- You may make a collection consisting of the Document and other
- documents released under this License, and replace the individual
- copies of this License in the various documents with a single
- copy that is included in the collection, provided that you follow
- the rules of this License for verbatim copying of each of the
- documents in all other respects.
-
- You may extract a single document from such a collection, and
- distribute it individually under this License, provided you
- insert a copy of this License into the extracted document, and
- follow this License in all other respects regarding verbatim
- copying of that document.
-
- 7. AGGREGATION WITH INDEPENDENT WORKS
-
- A compilation of the Document or its derivatives with other
- separate and independent documents or works, in or on a volume of
- a storage or distribution medium, is called an "aggregate" if the
- copyright resulting from the compilation is not used to limit the
- legal rights of the compilation's users beyond what the
- individual works permit. When the Document is included in an
- aggregate, this License does not apply to the other works in the
- aggregate which are not themselves derivative works of the
- Document.
-
- If the Cover Text requirement of section 3 is applicable to these
- copies of the Document, then if the Document is less than one
- half of the entire aggregate, the Document's Cover Texts may be
- placed on covers that bracket the Document within the aggregate,
- or the electronic equivalent of covers if the Document is in
- electronic form. Otherwise they must appear on printed covers
- that bracket the whole aggregate.
-
- 8. TRANSLATION
-
- Translation is considered a kind of modification, so you may
- distribute translations of the Document under the terms of
- section 4. Replacing Invariant Sections with translations
- requires special permission from their copyright holders, but you
- may include translations of some or all Invariant Sections in
- addition to the original versions of these Invariant Sections.
- You may include a translation of this License, and all the
- license notices in the Document, and any Warranty Disclaimers,
- provided that you also include the original English version of
- this License and the original versions of those notices and
- disclaimers. In case of a disagreement between the translation
- and the original version of this License or a notice or
- disclaimer, the original version will prevail.
-
- If a section in the Document is Entitled "Acknowledgements",
- "Dedications", or "History", the requirement (section 4) to
- Preserve its Title (section 1) will typically require changing
- the actual title.
-
- 9. TERMINATION
-
- You may not copy, modify, sublicense, or distribute the Document
- except as expressly provided under this License. Any attempt
- otherwise to copy, modify, sublicense, or distribute it is void,
- and will automatically terminate your rights under this License.
-
- However, if you cease all violation of this License, then your
- license from a particular copyright holder is reinstated (a)
- provisionally, unless and until the copyright holder explicitly
- and finally terminates your license, and (b) permanently, if the
- copyright holder fails to notify you of the violation by some
- reasonable means prior to 60 days after the cessation.
-
- Moreover, your license from a particular copyright holder is
- reinstated permanently if the copyright holder notifies you of
- the violation by some reasonable means, this is the first time
- you have received notice of violation of this License (for any
- work) from that copyright holder, and you cure the violation
- prior to 30 days after your receipt of the notice.
-
- Termination of your rights under this section does not terminate
- the licenses of parties who have received copies or rights from
- you under this License. If your rights have been terminated and
- not permanently reinstated, receipt of a copy of some or all of
- the same material does not give you any rights to use it.
-
- 10. FUTURE REVISIONS OF THIS LICENSE
-
- The Free Software Foundation may publish new, revised versions of
- the GNU Free Documentation License from time to time. Such new
- versions will be similar in spirit to the present version, but
- may differ in detail to address new problems or concerns. See
- <http://www.gnu.org/copyleft/>.
-
- Each version of the License is given a distinguishing version
- number. If the Document specifies that a particular numbered
- version of this License "or any later version" applies to it, you
- have the option of following the terms and conditions either of
- that specified version or of any later version that has been
- published (not as a draft) by the Free Software Foundation. If
- the Document does not specify a version number of this License,
- you may choose any version ever published (not as a draft) by the
- Free Software Foundation. If the Document specifies that a proxy
- can decide which future versions of this License can be used,
- that proxy's public statement of acceptance of a version
- permanently authorizes you to choose that version for the
- Document.
-
- 11. RELICENSING
-
- "Massive Multiauthor Collaboration Site" (or "MMC Site") means
- any World Wide Web server that publishes copyrightable works and
- also provides prominent facilities for anybody to edit those
- works. A public wiki that anybody can edit is an example of such
- a server. A "Massive Multiauthor Collaboration" (or "MMC")
- contained in the site means any set of copyrightable works thus
- published on the MMC site.
-
- "CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
- license published by Creative Commons Corporation, a
- not-for-profit corporation with a principal place of business in
- San Francisco, California, as well as future copyleft versions of
- that license published by that same organization.
-
- "Incorporate" means to publish or republish a Document, in whole
- or in part, as part of another Document.
-
- An MMC is "eligible for relicensing" if it is licensed under this
- License, and if all works that were first published under this
- License somewhere other than this MMC, and subsequently
- incorporated in whole or in part into the MMC, (1) had no cover
- texts or invariant sections, and (2) were thus incorporated prior
- to November 1, 2008.
-
- The operator of an MMC Site may republish an MMC contained in the
- site under CC-BY-SA on the same site at any time before August 1,
- 2009, provided the MMC is eligible for relicensing.
-
-ADDENDUM: How to use this License for your documents
-====================================================
-
-To use this License in a document you have written, include a copy of
-the License in the document and put the following copyright and
-license notices just after the title page:
-
- Copyright (C) YEAR YOUR NAME.
- Permission is granted to copy, distribute and/or modify this document
- under the terms of the GNU Free Documentation License, Version 1.3
- or any later version published by the Free Software Foundation;
- with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
- Texts. A copy of the license is included in the section entitled ``GNU
- Free Documentation License''.
-
- If you have Invariant Sections, Front-Cover Texts and Back-Cover
-Texts, replace the "with...Texts." line with this:
-
- with the Invariant Sections being LIST THEIR TITLES, with
- the Front-Cover Texts being LIST, and with the Back-Cover Texts
- being LIST.
-
- If you have Invariant Sections without Cover Texts, or some other
-combination of the three, merge those two alternatives to suit the
-situation.
-
- If your document contains nontrivial examples of program code, we
-recommend releasing these examples in parallel under your choice of
-free software license, such as the GNU General Public License, to
-permit their use in free software.
-
-
-
-Tag Table:
-Node: Top850
-Node: Overview1842
-Node: Disclaimer2689
-Node: Installation3185
-Node: How to Use3642
-Node: JavaScript Detection7147
-Node: Free Licenses Detection8434
-Node: Setting Your JavaScript Free8904
-Node: LibreJS Development Notes19617
-Node: Installation Requirements22881
-Node: LibreJS Internals23591
-Node: GNU Free Documentation License24241
-
-End Tag Table
-
-
-Local Variables:
-coding: utf-8
-End: