Issue 5554 - [webextensions] Adjust data to account for UI limitations

lib/prefs.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 33 matching lines @@
 /**
  * Only for compatibility with core code. Please do not change!
  *
  * @type {string}
  */
 defaults.data_directory = "";
 /**
  * @see https://adblockplus.org/en/preferences#patternsbackups
  * @type {number}
  */
-defaults.patternsbackups = 5;
+defaults.patternsbackups = 0;
 /**
  * @see https://adblockplus.org/en/preferences#patternsbackupinterval
  * @type {number}
  */
 defaults.patternsbackupinterval = 24;
 /**
  * Only for compatibility with core code. Please do not change!
  *
  * @type {boolean}
  */
@@ skipping 76 matching lines @@
  */
 defaults.hidePlaceholders = true;
 
 /**
  * Whether notification opt-out UI should be shown.
  * @type {boolean}
  */
 defaults.notifications_showui = false;
 
 /**
+ * Determines whether data has been cleaned up after upgrading from the legacy
+ * extension on Firefox.
+ *
+ * @type {boolean}
+ */
+defaults.data_cleanup_done = false;
+
+/**
  * Notification categories to be ignored.
  *
  * @type {string[]}
  */
 defaults.notifications_ignoredcategories = [];
 
 /**
  * Whether to show the developer tools panel.
  *
  * @type {boolean}
@@ skipping 153 matching lines @@
           eventEmitter.emit(pref);
         }
       }
     });
   }
 
   Prefs.untilLoaded = Promise.all([localLoaded, managedLoaded]).then(onLoaded);
 }
 
 init();