How doI to revert to the previous version of Firefox I had before downloading the latest one.?

Question

I miss the ease of use of the google toolbar and its features; these cannot be used with this latest version of Firefox. I was content with the previous version I was using.

Answer 1

Previous versions are no longer maintained for security and stability issues.
*You are risking your private information and online security when using an unsupported version.
*Only Firefox 8 and Firefox 3.6.24 are currently supported and updated.
*Support for Firefox 3.6.24 is likely to end in the first quarter of 2012.
Google decided that they will no longer produce the Google Toolbar for Firefox 5 and newer version. It is best to move on to other alternatives than to try any "hacks" to the toolbar that may or may not perform in the future. 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
'''''To access your Google Bookmarks visit''''' www.google.com/bookmarks.
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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Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
*Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.com/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.com/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]