How do I go back to 4.0 after upgrading to 4.0.1 ?

I upgraded to version 4.0.1 two days ago. I haven't been pleased with the performance (frequent freezes, slow loading), and one of my favorite tools that I need for work doesn't work properly. I'd like to uninstall the upgrade and go back to 4.0. How do I do that?

That's not a good idea. See: [http://www.mozilla.org/security/known-vulnerabilities/firefox40.html#firefox4.0.1 Security issues fixed in Firefox 4.0.1]
You can revert to the previous secure version if you wish which is 3.6.17 as follows: 
#Go to [http://www.mozilla.com/en-US/firefox/all-older.html Download Firefox v3.6.17] and download it to the desktop. 
#Then go to Add/Remove Programs, scroll down to "Mozilla Firefox" and remove it, choosing to keep your bookmarks, customizations etc., (''don't checkmark the box''). 
#Then reboot and delete the folder called "Mozilla Firefox" at this location: C:\Program Files\Mozilla Firefox 
#Finally run the installation file you downloaded to the desktop earlier. 
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation. 
After you complete the installation, go to the [http://www.mozilla.com/en-US/plugincheck/ Plugins Check] page and update where necessary.
I would suggest in the first instance though to perform a standard diagnostic to correct the anomalies. See: [[Basic troubleshooting]]

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