We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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 rollback to ver 3.6 from ver 4?

  • 2 replies
  • 24 have this problem
  • 1 view
  • Last reply by mudd

more options

Firefox 4 is causing me too many problems* and I'd like to go back to version 3.6. Can I re-download version 3.6 and install it over the top of version 4? Where can I download it?

Thank you.

  • problems: slow starting, page loading, more than doubled RAM usage, crashes, incompatible extensions/add-ons.
Firefox 4 is causing me too many problems* and I'd like to go back to version 3.6. Can I re-download version 3.6 and install it over the top of version 4? Where can I download it? Thank you. * problems: slow starting, page loading, more than doubled RAM usage, crashes, incompatible extensions/add-ons.

All Replies (2)

more options

Looks like I found the version 3.6 download page myself:

http://www.mozilla.com/en-US/firefox/all-older.html

Another answer to this question suggests uninstalling version 4 first, but I'm going to try installing 3.6 over the top of 4 so I hopefully don't lose my add-ons, etc.

more options

Update: I was able to simply install version 3.6 over the top of version 4 with no problems, and all seems to be working well again, including my old add-ons.