Rated 5 out of 5 stars

per José A. Romero L. el des. 13, 2014 · enllaç permanent

Firefox 34 is more careful with how XBL bindings are applied to untrusted content (see Bug 1050049 in Bugzilla). The way to make this add-on work again is actually pretty straightforward: add an attribute: bindToUntrustedContent="true" to the [binding] element in the chrome/content/focusregainer.xml file inside the XPI.

I don't use the non-lite version of the add-on, but probably the fix will be the same there.