Firefox minimal userChromeJS to modify native keyboard shortcuts

config-prefs.js

// config-prefs.js - a minimal bootstrap
// create in Firefox defaults pref directory - for windows = C:\Program Files\Mozilla Firefox\defaults\pref\
// must also create C:\Program Files\Mozilla Firefox\config.js
pref("general.config.filename", "config.js");
pref("general.config.obscure_value", 0);
pref("general.config.sandbox_enabled", false);

config.js

// config.js - a minimal bootstrap
// create in Firefox install directory - for windows = C:\Program Files\Mozilla Firefox\
// must also create C:\Program Files\Mozilla Firefox\defaults\pref\config-prefs.js
try {
  let { classes: Cc, interfaces: Ci, manager: Cm  } = Components;
  const {Services} = Components.utils.import('resource://gre/modules/Services.jsm');
  function ConfigJS() { Services.obs.addObserver(this, 'chrome-document-global-created', false); }
  ConfigJS.prototype = {
    observe: function (aSubject) { aSubject.addEventListener('DOMContentLoaded', this, {once: true}); },
    handleEvent: function (aEvent) {
      let document = aEvent.originalTarget; let window = document.defaultView; let location = window.location;
      if (/^(chrome:(?!\/\/(global\/content\/commonDialog|browser\/content\/webext-panels)\.x?html)|about:(?!blank))/i.test(location.href)) {
        if (window._gBrowser) {
          ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
          const NS_XUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
          const mainKeysetElem = document.getElementById("mainKeyset");

          // 交換 Ctrl+Shift+O (管理書籤) 和 Ctrl+Shift+B (顯示書籤工具列)
          let keyManageBookmarks = document.getElementById("manBookmarkKb");
          keyManageBookmarks.setAttribute( "key", "B" );
          let keyToolbarBookmarks = document.getElementById("viewBookmarksToolbarKb");
          keyToolbarBookmarks.setAttribute( "key", "O" );

          // 移除 Ctrl+B (開啟書籤側欄)
          let keySidebarBookmarks = document.getElementById("viewBookmarksSidebarKb");
          keySidebarBookmarks.removeAttribute( "key" );
          keySidebarBookmarks.removeAttribute( "modifiers" );

          // 加入 Ctrl+ALT+S (將側邊欄移至右方)
          let keySidebarReverse = mainKeysetElem.appendChild(document.createElementNS(NS_XUL, "key"));
          keySidebarReverse.setAttribute("id", "key_sidebarReverse");
          keySidebarReverse.setAttribute("modifiers", "accel,alt");
          keySidebarReverse.setAttribute("key", "S");
          keySidebarReverse.setAttribute("oncommand", "SidebarUI.reversePosition();");
          let menuSidebarReverseElem = document.getElementById('sidebar-reverse-position');
          menuSidebarReverseElem.setAttribute("key", "key_sidebarReverse");
          ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        }
      }
    }
  };
  if (!Services.appinfo.inSafeMode) { new ConfigJS(); }
} catch(ex) {};