Removing the info file

It is hosted at https://www.gnu.org/software/librejs/manual/.

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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.
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-     (Thus, if the Document is in part a textbook of mathematics, a
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-     The "Invariant Sections" are certain Secondary Sections whose
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-     the notice that says that the Document is released under this
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-     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.
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-     A "Transparent" copy of the Document means a machine-readable
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-     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".
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-     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.
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-     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.
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-     copies of the Document to the public.
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-     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.
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-     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,
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-     electronic form.  Otherwise they must appear on printed covers
-     that bracket the whole aggregate.
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-  8. TRANSLATION
-
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-     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
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-     disclaimers.  In case of a disagreement between the translation
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-     disclaimer, the original version will prevail.
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-     "Dedications", or "History", the requirement (section 4) to
-     Preserve its Title (section 1) will typically require changing
-     the actual title.
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-     and will automatically terminate your rights under this License.
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-     the same material does not give you any rights to use it.
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-  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
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-     2009, provided the MMC is eligible for relicensing.
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-ADDENDUM: How to use this License for your documents
-====================================================
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-To use this License in a document you have written, include a copy of
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