This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How can I get back to using FF3.6.16 after downloading FF4.0.1?

more options

Even though I have "downloaded" FF4.0.1 and it shows up in my applications file as 4.0.1, when I open FF I get a message that I still need to install 4.0.1. In addition I am reading on the support site that FF4 has lots of problems. As a user with only the most basic command, miniscule command of computer, browser, internet, I want to go back to something that never gave me any problems.

Even though I have "downloaded" FF4.0.1 and it shows up in my applications file as 4.0.1, when I open FF I get a message that I still need to install 4.0.1. In addition I am reading on the support site that FF4 has lots of problems. As a user with only the most basic command, miniscule command of computer, browser, internet, I want to go back to something that never gave me any problems.

All Replies (3)

more options

Credit Tony E

To downgrade to Firefox 3.6 first uninstall Firefox 4, but do not select the option to "Remove my Firefox personal data". If you select that option it will delete your bookmarks, passwords and other user data. See https://support.mozilla.com/kb/Uninstalling+Firefox

You can then install the latest version of Firefox 3.6 available from http://www.mozilla.com/en-US/firefox/all-older.html - it will automatically use your current bookmarks, passwords etc.

To avoid possible problems with downgrading, I recommend going to your profile folder and deleting the following files if they exist - extensions.cache, extensions.rdf, extensions.ini, extensions.sqlite and localstore.rdf. Deleting these files will force Firefox to rebuild the list of installed extensions, checking their compatibility, and reset toolbar customizations.

For details of how to find your profile folder see https://support.mozilla.com/kb/Profiles

more options

How do I uninstall Firefox 4?

more options

I do not like that the Home button is at the far right now instead of the left. The human eyes naturally starts at the left. Why did you change that Mozilla? At least give users the option to move it where they like it. That kind of personalization functionality in the future would be very kewl.

Modified by salesvisionaries