Add-ons using the techniques described in this document are considered a legacy technology in Firefox. Don't use these techniques to develop new add-ons. Use WebExtensions instead. If you maintain an add-on which uses the techniques described here, consider migrating it to use WebExtensions.

Starting from Firefox 53, no new legacy add-ons will be accepted on addons.mozilla.org (AMO) for desktop Firefox and Firefox for Android.

Starting from Firefox 57, only extensions developed using WebExtensions APIs will be supported on Desktop Firefox and Firefox for Android.

Even before Firefox 57, changes coming up in the Firefox platform will break many legacy extensions. These changes include multiprocess Firefox (e10s), sandboxing, and multiple content processes. Legacy extensions that are affected by these changes should migrate to use WebExtensions APIs if they can. See the "Compatibility Milestones" document for more information.

A wiki page containing resources, migration paths, office hours, and more, is available to help developers transition to the new technologies.

The BrowserApp object is only available to privileged code running on Firefox for Android, and is intended for use by Firefox for Android add-ons.


BrowserApp.loadURI(uri, browser, params) loads the specified URI into the specified browser.



window.BrowserApp.loadURI(uri, browser);

window.BrowserApp.loadURI(uri, browser, params);

The URI to open represented as a string.
The browser in which to open the URI. This is an optional parameter: if it is omitted the URI is opened in the browser hosted by the currently selected tab.
An optional set of parameters. These are the same parameters as those supplied to the loadURIWithFlags() method.


This code loads "http://www.mozilla.org/" into the first tab:

window.BrowserApp.loadURI("http://www.mozilla.org/", window.BrowserApp.tabs[0].browser);

See Also

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Contributors to this page: wbamberg, rebloor, andrewtruongmoz
Last updated by: wbamberg,