update 109.0
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.
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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.
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).
- Help -> More Troubleshooting Information -> Profile Folder/Directory:
Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder - https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
I've already tried the rename/remove xulstore.json file, did not help. Holding the ctrl key while closing did not help either.