Try using this extension to force compatibility

https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/

Check and tell if its working.

Firefox 4 is not secure; Firefox 5 is a security and stability update for Firefox 4. The only currently supported versions of Firefox are Firefox 5 and Firefox 3.6.19 (support to expire in a month or two).

As for the Google toolbar....

Google decided that they will no longer produce the Google Toolbar for Firefox beyond Firefox 4.

• http://googletoolbarhelp.blogspot.com/2011/07/update-on-google-toolbar-for-firefox.html
• http://www.google.com/support/toolbar/bin/answer.py?answer=1342452&topic=15356%29

Alternatives:

• http://kb.mozillazine.org/Using_Google_Toolbar_features_without_toolbars
• https://addons.mozilla.org/en-US/firefox/addon/googlebar-lite/
• https://addons.mozilla.org/en-US/firefox/addon/gbookmarks-google-bookmarks-fo/

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Thanks very much for your reply. Most helpful and has solved the issue and problem. Very much appreciative.

Thanks so much your advice. Very appreciative. I will try and report back to you. (It was so nice before to have Firefox with Google toolbar. I guess in the end I may have to install the google toolbar onto internet explorer (which is kind of slow)