Issue 5588 - Clear badge text only if zero hits

lib/stats.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 21 matching lines @@
  * @param  {Page} page
  * @return {Number}
  */
 exports.getBlockedPerPage = page => blockedPerPage.get(page) || 0;
 
 // Chrome automatically clears the browser action badge text when the URL of
 // the tab is updated, but Firefox doesn't.
 // https://bugzilla.mozilla.org/show_bug.cgi?id=1395074
 ext.pages.onLoading.addListener(page =>
 {
-  page.browserAction.setBadge();
+  if (!blockedPerPage.get(page))
+    page.browserAction.setBadge();
 });
 
 FilterNotifier.on("filter.hitCount", (filter, newValue, oldValue, page) =>
 {
   if (!(filter instanceof BlockingFilter) || !page)
     return;
 
   Prefs.blocked_total++;
 
   let blocked = blockedPerPage.get(page) || 0;
@@ skipping 26 matching lines @@
             color: badgeColor,
             number: blocked
           };
         }
       }
 
       page.browserAction.setBadge(badge);
     }
   });
 });