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Google Toolbar
Google decided that they will no longer produce the Google Toolbar for Firefox beyond Firefox 4. Future versions of Google toolbar will only work with IE7-9. Google Toolbar is not available on any other browser, even Google's own browser.

• 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
• Google Toolbar 8 FAQ (IE only): https://www.google.com/support/toolbar/bin/answer.py?hl=en&answer=1111588

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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If FireFox 5 and 6 will not be compatible with Google Tool Bar, unfortunetly I have to use Internet Explorer and not FireFox. It is unfortunate because FireFox (in my opinion) is better than IE.

Did you read about the alternatives to the Google Toolbar?
http://kb.mozillazine.org/Using_Google_Toolbar_features_without_toolbars

http://googletoolbarhelp.blogspot.com/2011/07/update-on-google-toolbar-for-firefox.html

 2011-07-19
An update on Google Toolbar for Firefox
First of all, we'd like to thank all of our loyal users of Google Toolbar for Firefox. We deeply appreciate all of the feedback over the years that helped to make the product so useful. As we all know, over the past few years, there has been a tremendous amount of innovation in the browser space. For Firefox users, many features that were once offered by Google Toolbar for Firefox are now already built right into the browser. Therefore, while Google Toolbar for Firefox works on versions up to and including Firefox 4 only, it will not be supported on Firefox 5 and future versions. 
 

They say that Firefox has many of the Google Toolbar features, and that's why they aren't going to continue development of it for Firefox 4 and beyond.