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