uBlock/platform/firefox/frameScript.js

68 lines
2.5 KiB
JavaScript
Raw Normal View History

/*******************************************************************************
uBlock Origin - a browser extension to block requests.
Copyright (C) 2014-2016 The uBlock Origin authors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
/******************************************************************************/
2015-09-30 15:33:38 +02:00
// https://developer.mozilla.org/en-US/Firefox/Multiprocess_Firefox/Frame_script_environment
(function() {
'use strict';
2015-01-11 18:41:52 +01:00
if ( !this.docShell ) {
return;
}
let {LocationChangeListener} = Components.utils.import(
Components.stack.filename.replace('Script', 'Module'),
null
);
// https://github.com/gorhill/uBlock/issues/1444
// Apparently the same context is used for all extensions, hence we must
// use scoped variables to ensure no collision.
let locationChangeListener;
// https://developer.mozilla.org/en-US/Add-ons/Code_snippets/Progress_Listeners
// "Note that the browser uses a weak reference to your listener object,
// "so make sure to keep an external reference to your object to ensure
// "that it stays in memory."
// This listener below allows us to keep `locationChangeListener` alive
// until we no longer need it.
let shutdown = function(ev) {
if ( ev.target === this ) {
this.removeEventListener('unload', shutdown);
locationChangeListener = null;
}
};
this.addEventListener('unload', shutdown);
let webProgress = this.docShell
.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIWebProgress);
if ( webProgress && webProgress.isTopLevel ) {
locationChangeListener = new LocationChangeListener(this.docShell, webProgress);
}
}).call(this);
/******************************************************************************/