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

firefox won't start, can not get profile manager to run either, have re-install a few times already

  • 2 replies
  • 1 has this problem
  • 1 view
  • Last reply by cor-el

more options

FIrefox all of a sudden doesn't work, I re-installed it a couple of times already, after installation I have launch Firefox button with a check mark, but no firefox window. I see firefox.exe in the Task Manager, it has some CPU usage, and CPU usage drop down to zero after a few minutes. No firefox window, I even left it as is for a few hours, nothing happened. Looked in the support forum, tried "firefox.exe -P", "C:\Program Files\Mozilla Firefox\firefox.exe" -P, no profile window show up.

FIrefox all of a sudden doesn't work, I re-installed it a couple of times already, after installation I have launch Firefox button with a check mark, but no firefox window. I see firefox.exe in the Task Manager, it has some CPU usage, and CPU usage drop down to zero after a few minutes. No firefox window, I even left it as is for a few hours, nothing happened. Looked in the support forum, tried "firefox.exe -P", "C:\Program Files\Mozilla Firefox\firefox.exe" -P, no profile window show up.

All Replies (2)

more options
more options

Can you open the System menu via "Alt + Space" in case the Firefox window is off screen?

Try to rename/remove the xulstore.json file in the Firefox profile folder. Firefox profile folder is in a hidden location in AppData\Roaming.

  • C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\

"AppData" (XP: Application Data; Mac: ~/Library; Linux: ~/.mozilla) is a hidden folder.