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Yesterday, I noticed after I closed and re-opened Firefox, my browsing session was completely gone - all my tabs and windows, my entire browsing history, website sign-in status, all completely gone. I've been troubleshooting since then.

I've noticed that the 'sessionstore-backups' folder in my profile folder is missing. When I open Firefox, this folder is created and Firefox writes some data to it, but Firefox seems to delete the folder as soon as I quit Firefox. Firefox should not be doing this. My Firefox is configured to open previous windows and tabs, and is NOT configured to wipe any browsing data of any kind when it closes.

As a sanity check, I spun up a Windows Sandbox (briefly, it's a clean, isolated Windows environment) and installed Firefox there. I also enabled the option 'Open previous windows and tabs'. Firefox behaves normally - it re-opens the tabs/windows I had open when I quit Firefox. Great, that's what I expect. The trouble starts as soon as I sign in to sync. After signing in to sync, and letting the initial sync process complete, I open a couple of windows and tabs, then quit Firefox. Firefox begins nuking my browsing session again - the 'sessionstore-backups' folder is erased, and next time I start Firefox, all my windows and tabs are missing, and my browsing history is missing.

So, at this point, I'm assuming something in my synced data has become corrupt. I haven't installed any new extensions lately. I haven't changed any of Firefox's settings that would cause this to happen. The only thing I have done differently lately was enable Firefox Sync in LibreWolf and sign in to sync there. It seems like this session-nuking trouble started after I signed in to sync in LibreWolf. I assumed, since LibreWolf is a fork of Firefox, and because there were no warnings or indications the feature was incomplete/unstable/experimental/etc., that it would just work, that it wouldn't cause any issues. But it seems like it has caused issues. I checked LibreWolf's issues tracker for anything related to 'sync', but I didn't see anything noteworthy.

I've been using Firefox and Sync for numerous years without issue. This session-nuking thing started yesterday.

I use Firefox in a few places, and based on what I saw happen in my Windows Sandbox, this session-nuking issue is going to happen in every Firefox I'm signed in to as soon as it has a chance to sync. Obviously, I do not want this to happen.

What can I do to determine what the issue is? What can I do to check if something in my synced data has become corrupted? What can I do to reverse it? I'm not opposed to completely wiping/resetting my synced data, but I'd rather not if I don't have to. The only thing I would lose sleep over is my bookmarks, but I know I can export them. Are there any debug logs I can enable/look at? Anything I should look for in Event Viewer?

Thanks.

I changed pwd for my firefox acc 2-3 month ago and after it I was logged in only on my laptop. One week ago I changed OS on my laptop and forgot that while U changed pwd U also logged off from all devices. So I cant reach my acc from my 2nd laptop and my phone cause I don't remember pwd. I only remember pwd what was before that one. So I restore it. And now I haven't my pwds, bookmarks, extensions etc. What I can do now? Can I restore all this things?

So I Recently Uninstalled Firefox and had a tab,and the installed it on the same device,and now when I log in there is a duplicate version of my device account,how do I fix this?

hi

i had my all data saved in my firefox online account , now i logged in on my new laptop , i logged in with my id but i cant find my bookmarks passwords , extensions etc . please help

Be descriptive. Saying “playing video on YouTube is always choppy” will help us understand the issue better than saying “something is wrong” or “the app is broken”.

XUL Runner platform version 129.01 is not compatible with 129.0 miniversion 129.0 maxversion 129.0 When this happened at first I did not have the use of Firefox. I then went to Firefox and down downloaded Firefox and started over. Then I went to go to my bookmarks and could not find them, bummer. Now I still get this XUL Runner message ??????? email guybrochu@yahoo.com

Hello. I got a new pc and I am trying to sync my Mozilla account right now but I am not getting a the code to my email so I can not login to the account. The mail in question is *@cock.li that I have all my old data on.

Dear Mozilla team, as a old fan from early days of Mozilla Firefox, Im quite dissapointed with the same issue I am facing with Firefox browser. Even I created my profile, which one you can check from which year has been created, even after I synchronised all my bookmars, passwords etc etc, still no data is restored. I formated my laptop last week and thought that this time, with syncronising I will save a lot of time buut veery dissapointed again. STILL I am not having back my 100+ login details saved on Firefox. Also tabs. Now, on my browser promts taht my account is all syncronised but still blanco browser, with not a single saved data!

I will appreciate your help to get back my data, as soon as possible.

Regards, Enis Jusufi

As mentioned in the title, I was trying a new Firefox installation, and whenever I login, I receive the confirmation code to my mail, and after I fill it correctly and I am able to login, there is an "Account Disconnected" message in my sync settings. If I try to login again, I still have the same issue.

Hi!

I use uBlock Origin on Firefox Mobile and Desktop, and my custom filters are not being synced across the two instances. According to the extension author, Firefox does not support this functionality: https://www.reddit.com/r/uBlockOrigin/comments/11z4s2i/syncing_ublock_filters_rules_etc_between_firefox/

Is this something Firefox could get support for in the future?

Good morning

My problem is when I open navigation in Mozilla, it opens fine, when I click on navigate it opens the Google Maps tab to install, but I already have it installed and the updates are up to date.
Can you help?
Thank you

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.

Thanks

Can this be done? I am old and confused. I'm not sure this is possible. When I use me samsung tablet with firefox all the shortcuts are there. They no longer show up on my mac desktop. Is it possible to get online help to manage this?

Hello, I have developed an addon, which is working fine on desktop as temporary extension, but when I try to install it after zipping, firfox says, it is corrupt and cannot be istalled. and second, how can I use my addon on android firfox. Can it be loaded as temporary extension as desktop version. Please guide.