You want the Yahoo toolbar and the Google Toolbar together? See Problematic Extensions http://kb.mozillazine.org/Problematic_extensions According to the addon's site IMFU is updated :My IMFU :: Add-ons for Firefox :https://addons.mozilla.org/en-US/firefox/addon/my-imfu/ Likewise, according the addons site Yahoo Toolbar is updated :Yahoo! Toolbar :: Add-ons for Firefox :https://addons.mozilla.org/en-US/firefox/addon/yahoo-toolbar/ '''The Google Toolbar is no longer supported by Google in Firefox 5 and up''', you may be able to get what you want from it for a limited time, the directions to install the Google Toolbar were posted before Google actually announced dropping support. *Enable Google Toolbar in Firefox 5<br>http://googlesystem.blogspot.com/2011/06/enable-google-toolbar-in-firefox-5.html *the-edmeister posted a brief evaluation of the situation<br>https://support.mozilla.com/questions/841736 In any case you will have to find alternative solutions, see * "'''Using Google Toolbar features without toolbars'''" <br>http://kb.mozillazine.org/Using_Google_Toolbar_features_without_ You can test out the alternatives now, rather than waiting for things to break more for you.