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Asked: 2026-06-06T10:47:38+00:00

In Firefox version 13, bookmarklets (bookmarks with a javascript: URL, e.g. javascript: alert(it works)

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In Firefox version 13, bookmarklets (bookmarks with a javascript: URL, e.g. javascript: alert("it works") stopped working. Is there any solution to use javascript: bookmarks in Firefox 13?

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  1. Editorial Team

    This is a consequence of Bug 728313 – Using a bookmark keyword to a bookmarklet fails on new tabs, also Bug 739387 – Aurora 13a New Tab display doesn’t allow javascript bookmarks to be selected . This bug affects Firefox 13 onwards.

    As a consequence of the fix to bug 723808, javascript: bookmarks are disabled in a just-created new tab. If you first load almost any URL, including about:blank, then a Javascript bookmark will work in that tab.

    Note that this is about Javascript bookmarks (bookmarklets). You cannot use this workaround to load javascript: URLs typed directly in the location bar. These have been disabled since Firefox 6, as a consequence of bug 656433 (phishing of javascript: URLs). Bug 680302 is a feature request to allow turning javascript: URLs back on through a preference. Valadrem has written the InheritPrincipal extension to remove this restriction (I haven’t tested it). You can still type and run Javascript code in the Scratchpad (press Shift+F4, type code, press Ctrl+R).

    There are restrictions on the Javascript you can run from the URL bar or from a bookmark. For example, since Firefox 7, you cannot resize the window (consequence of the fix to bug 565541); the services.sync.prefs.sync.dom.disable_window_move_resize controls this restriction.

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