Javascript bookmark stopped working in Firefox 13

Question

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?

Answer 1

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.

Answer 2

NOTE: this solution no longer appears to work as of FF41. See JS Bookmarklets stopped working in Firefox 41.

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If you first load almost any URL, including about:blank, then a Javascript bookmark will work in that tab.

Since Firefox's default behavior for new tabs is about:newtab, which is nothing, and bookmarklets only run once something is loaded, you can do the following to set a default page, and then run bookmarklets:

1. open about:config
2. find browser.newtab.url
3. double-click and change from about:newtab to about:blank (or URI of your choice)
4. Ctrl-T and run bookmarklets in new tabs!