Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

I downloaded Firefox 4 but my laptop cannot open Firefox 4. I want my old Firefox so I don't lose my bookmarks, etc. Now I can't open Firefox at all.

  • 1 reply
  • 4 have this problem
  • 7 views
  • Last reply by TonyE

more options

As propmted by firefox, I downloaded Firefox 4 for my Mac. However, my Mac is not able to open this version of Firefox. I bought the computer in 2007 and have not had it updated since. I replaced my old firefox so now I cannot open the browser at all. Can I download an old version of firefox? Are my bookmarks lost?

As propmted by firefox, I downloaded Firefox 4 for my Mac. However, my Mac is not able to open this version of Firefox. I bought the computer in 2007 and have not had it updated since. I replaced my old firefox so now I cannot open the browser at all. Can I download an old version of firefox? Are my bookmarks lost?

All Replies (1)

more options

Firefox 4 requires at least OS X 10.5. You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

When you re-install Firefox 3.6 it will use your existing bookmarks and other user data.