Noissue - Simplify write throttling for blocked_total pref on Firefox

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 282 matching lines @@
 {
   return browser.storage.local.set({[prefToKey(pref)]: overrides[pref]});
 }
 
 let customSave = new Map();
 if (require("info").platform == "gecko")
 {
   // Saving one storage value causes all others to be saved as well on Gecko.
   // Make sure that updating ad counter doesn't cause the filters data to be
   // saved frequently as a side-effect.
-  const MIN_UPDATE_INTERVAL = 60 * 1000;
-  let lastUpdate = -MIN_UPDATE_INTERVAL;
   let promise = null;
   customSave.set("blocked_total", pref =>
   {
     if (!promise)
     {
       promise = new Promise((resolve, reject) =>
       {
         setTimeout(
           () =>
           {
-            lastUpdate = performance.now();
             promise = null;
             savePref(pref).then(resolve, reject);
           },
-          lastUpdate + MIN_UPDATE_INTERVAL - performance.now()
+          60 * 1000
         );
       });
     }
     return promise;
   });
 }
 
 function addPreference(pref)
 {
   Object.defineProperty(Prefs, pref, {
@@ skipping 57 matching lines @@
           eventEmitter.emit(pref);
         }
       }
     });
   }
 
   Prefs.untilLoaded = Promise.all([localLoaded, managedLoaded]).then(onLoaded);
 }
 
 init();