Bug 1578131 - (Multi-select tabs) Close window directly instead of removing tabs one by one when all tabs are selected and 'closeWindowWithLastTab' pref enabled. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D58699

browser/base/content/tabbrowser.js

@@ -3328,6 +3328,16 @@
     },
 
     removeTabs(tabs) {
+      // When 'closeWindowWithLastTab' pref is enabled, closing all tabs
+      // can be considered equivalent to closing the window.
+      if (
+        this.tabs.length == tabs.length &&
+        Services.prefs.getBoolPref("browser.tabs.closeWindowWithLastTab")
+      ) {
+        window.closeWindow(true, window.warnAboutClosingWindow);
+        return;
+      }
+
       this._clearMultiSelectionLocked = true;
 
       // Guarantee that _clearMultiSelectionLocked lock gets released.