Firefox Sync broken on multi-boot Windows
For years I had my Firefox sync working fine between Win10 PC, Android and several Win10 laptops. However yesterday I installed Windows 11 on the same PC I have Windows 10 (bought new disk) just to have a fresh install. Started with installing firefox - and here when problems begin. It couldn't let me log in into Sync, I was being immediately logged out ("Account disconnected"). Somehow I managed to log in, but then all my previous data was erased (passwords, bookmarks). I thought ok, maybe later it's gonna sync. Started installing extensions, saved one password. When trying to sync tabs with Android phone it didn't work, it couldn't see any tabs (but it could share tabs between devices!). On Android I still have old passwords and bookmarks saved, same as on old Win10 (on which I got logged out). Alright - it didn't sync after restart so I removed Firefox profile on machine, started again with logging in - and it synced only ONE password that I saved previously on same Win11 machine, with extensions I freshly installed back then. So it saved to sync improper data, forgetting about old? Logged out from all of my machines in Firefox Account. Now I'm back to my original machine on Windows 10. And what? I can't log in! Same error as on Win11 after install - "Account disconnected". Checked about:sync-log and found error logs - pasted into "Troubleshooting information" of this post.
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Did you copy the profile folder or other data to this device?
From the report:
FirefoxAccounts INFO An accountState promise was rejected, but we are ignoring that reason and rejecting it due to the account state changing. This can happen if a different account signed in or the account was signed out originally resolved with, : Error: Another user has signed in
You can check the connected devices under "Devices & Apps" on the Mozilla Account Settings page.
I didn't copy anything, logged in into sync as usual on fresh install. And as said I can't now even go back to my previous sync on old install. For me it's some data (like motherboard id or something) that is shared between multiboot instances and Firefox saves it to recognize devices, but messes with them if doubled (so same in win10 and win11). Any way for a quick fix and ability to properly connect and sync previous bookmarks and passwords for a new device (win11)? Sync for Android still works (or I believe so), but maybe it's just data that is local, downloaded earlier on that device (mean passwords).