Issue 5028 - Use browser namespace

lib/whitelisting.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 115 matching lines @@
 function revalidateWhitelistingState(page)
 {
   FilterNotifier.emit(
     "page.WhitelistingStateRevalidate",
     page, checkWhitelisted(page)
   );
 }
 
 FilterNotifier.on("filter.behaviorChanged", () =>
 {
-  chrome.tabs.query({}, tabs =>
+  browser.tabs.query({}, tabs =>
   {
     for (let tab of tabs)
       revalidateWhitelistingState(new ext.Page(tab));
   });
 });
 
 ext.pages.onLoading.addListener(revalidateWhitelistingState);
 
 let getKey =
 /**
@@ skipping 67 matching lines @@
       let key = checkKey(header.value, url);
       if (key)
       {
         recordKey(key, page, url);
         break;
       }
     }
   }
 }
 
-if (typeof chrome == "object")
+if (typeof browser == "object")
 {
-  chrome.webRequest.onHeadersReceived.addListener(
+  browser.webRequest.onHeadersReceived.addListener(
     onHeadersReceived,
     {
       urls: ["http://*/*", "https://*/*"],
       types: ["main_frame", "sub_frame"]
     },
     ["responseHeaders"]
   );
 }