2 files changed, 18 insertions, 2 deletions
diff --git a/src/background/actions/operation.js b/src/background/actions/operation.js
index 1e4990c..cfee868 100644
--- a/src/background/actions/operation.js
+++ b/src/background/actions/operation.js
@@ -27,6 +27,8 @@ const exec = (operation, tab) => {
     return tabs.selectFirstTab();
   case operations.TAB_LAST:
     return tabs.selectLastTab();
+  case operations.TAB_PREV_SEL:
+    return tabs.selectPrevSelTab();
   case operations.TAB_RELOAD:
     return tabs.reload(tab, operation.cache);
   case operations.TAB_PIN:
diff --git a/src/background/tabs.js b/src/background/tabs.js
index b34f7c2..d50d8e5 100644
--- a/src/background/tabs.js
+++ b/src/background/tabs.js
@@ -1,3 +1,13 @@
+let prevSelTab = 1;
+let currSelTab = 1;
+
+browser.tabs.onActivated.addListener((activeInfo) => {
+  return browser.tabs.query({ currentWindow: true }).then(() => {
+    prevSelTab = currSelTab;
+    currSelTab = activeInfo.tabId;
+  });
+});
+
 const closeTab = (id) => {
   return browser.tabs.remove(id);
 };
@@ -93,6 +103,10 @@ const selectLastTab = () => {
   });
 };
 
+const selectPrevSelTab = () => {
+  return browser.tabs.update(prevSelTab, { active: true });
+};
+
 const reload = (current, cache) => {
   return browser.tabs.reload(
     current.id,
@@ -117,6 +131,6 @@ const duplicate = (id) => {
 
 export {
   closeTab, reopenTab, selectAt, selectByKeyword, getCompletions,
-  selectPrevTab, selectNextTab, selectFirstTab, selectLastTab, reload,
-  updateTabPinned, toggleTabPinned, duplicate
+  selectPrevTab, selectNextTab, selectFirstTab, selectLastTab, selectPrevSelTab,
+  reload, updateTabPinned, toggleTabPinned, duplicate
 };