Firefox version 4 (4.0, 4.0.1) is no longer supported.

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
  http://googlesystem.blogspot.com/2011/06/enable-google-toolbar-in-firefox-5.html
• the-edmeister posted a brief evaluation of the situation
  https://support.mozilla.com/en-US/questions/841736

In any case you can find several alternative solutions, and you can start working on them now, see

• "Using Google Toolbar features without toolbars"
  http://kb.mozillazine.org/Using_Google_Toolbar_features_without_toolbars

If this solves your problem then mark as solved, if there is an aspect that is not covered directly or through searching extensions on that page, or other searching that you can try, please indicate what is not covered and describe what it does and we will try to help you with a Firefox solution. Don't expect to see anything that is an exact replacement of a Google Toolbar feature. Likewise if you have additional solutions not covered others would likely want to hear about them.

Install this add-on instead which does pretty much the same thing as the Google Toolbar: https://addons.mozilla.org/en-US/firefox/addon/googlebar/

If this answers your question, please click the Solved it button next to this post after you log in into the forum. This will help others searching for a solution to the same subject.

Thanks