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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

I downloaded Firefox version 4.0.1 today on a windows vista PC, and now I can't access firefox at all. I try to open it, but no firefox windows open up. Is there a way to fix this?

  • 1 reply
  • 22 have this problem
  • 1 view
  • Last reply by willyyam

DWGeek
DWGeek
more options

But when I try to uninstall the programme to try and download it again, it won't let me because it says firefox is still running, yet no windows are open.

But when I try to uninstall the programme to try and download it again, it won't let me because it says firefox is still running, yet no windows are open.

All Replies (1)

willyyam
willyyam
more options

I found that if I had a complicated session (lots of tabs open) that Firefox had trouble opening the first time (it has been fine since). To fix this I deleted my session files in my Profile after making a copy of them.

Here's how if you're still having trouble:

On Windows, your Profile is in "%APPDATA%\Mozilla\Firefox\Profiles" - paste that into the Run menu (Windows key + r) and look for session.rdf, sessionstore.bak and sessionstore.js. Delete those, restart Firefox and you should be on your home page. Good luck!