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

update 109.0

  • 3 replies
  • 0 have this problem
  • 11 views
  • Last reply by jstrunk1

more options

After updating to 109.0 Firefox won't open on primary monitor. I have moved it, closed it, but it restarts back on secondary monitor. After I move it to primary monitor, if I open another browser window it opens on the primary. I have renamed the xulstore.json file(so it creates a new one) but that did not help. It was working fine before the 109.0 update. I also have chrome installed and it works fine the way it should, so I'm thinking it is a Firefox 109.0 problem.

After updating to 109.0 Firefox won't open on primary monitor. I have moved it, closed it, but it restarts back on secondary monitor. After I move it to primary monitor, if I open another browser window it opens on the primary. I have renamed the xulstore.json file(so it creates a new one) but that did not help. It was working fine before the 109.0 update. I also have chrome installed and it works fine the way it should, so I'm thinking it is a Firefox 109.0 problem.

All Replies (3)

more options

Open Firefox (make sure it's just 1 window) and move it to the screen you want. While holding the ctrl key, click the X to close Firefox. When Firefox starts again, it should be on the last screen where it was closed.

more options

Try to rename/remove xulstore.json in the Firefox profile folder with Firefox closed.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

more options

I've already tried the rename/remove xulstore.json file, did not help. Holding the ctrl key while closing did not help either.