code: function _toggleLivePreviewMultiBrowser(value) {
          var val = _togglePref(PREF_MULTIBROWSER, value);
  
          CommandManager.get(Commands.TOGGLE_LIVE_PREVIEW_MB_MODE).setChecked(val);
          // Issue #10217: multi-browser does not support user server, so disable
          // the setting if it is enabled.
          CommandManager.get(Commands.FILE_PROJECT_SETTINGS).setEnabled(!val);
      }
docs: /* Toggles or sets the "livedev.multibrowser" preference