this is based on googlebar 0.9.15.14 (link) In order to install googlebar on a 3.5+ firefox dist then follow these steps: download the original xpi: https://addons.mozilla.org/en-US/firefox/addon/33 renane .xpi to .zip or open with an archive extractor open install.rdf with a text editor locate: em:maxVersion="3.0.*" change to em:maxVersion="X.X.*" pack