Firefox Community Forum

Dear Support,

Since ages ago I've always logged into Firefox and turned on sync so whichever device I was on (or if I have formatted my PC) I would still have acces to my browser history, tabs etc. Today I've formatted my PC to switch from win 10 to win 11 and logged into firefox as usual, but after trying to Sync nothing happens. My tabs, my history, everything is empty for some reason and I cannot find my original device (the one from a few hours ago connected in win 10) in my connected devices list either.

Please help me, my whole life is in that sync :(

Best Regards, Peter

I upgraded to Windows 11 yesterday. I have always been logged in to Firefox with my email, so I thought the bookmarks will come back once I log in on the new windows, but that didn't happen. Some of these bookmarks are work related, so they're fairly important.

Although I'm using the same email, my profile picture is gone too—replaced with a default one. (Not AI generated sentence. I just like using Em dashes)

What could have happened and what can I do to get my bookmarks back? I appreciate any suggestion you can give me.

Thank you in advance.

I have switched from chrome to firefox on my windows 11 laptop. I want to do the same on my pc but after signing into the Mozilla account, the bookmarks do not come in. History, and other things seem to work fine. I tried manually synchronizing in the settings over and over again but nothing works.

about:sync-log has the following: File:error-sync-1756470933956.txt 7 KB 29-08-2025 18:05:33 File:error-sync-1756472283448.txt 10 KB 29-08-2025 18:28:03 File:error-sync-1756472834423.txt 4 KB 29-08-2025 18:37:14 File:error-sync-1756475717646.txt 15 KB 29-08-2025 19:25:17 File:error-sync-1756537352383.txt 11 KB 30-08-2025 12:32:32 File:error-sync-1756550876616.txt 7 KB 30-08-2025 16:17:56 File:error-sync-1756555300057.txt 4 KB 30-08-2025 17:31:40 File:error-sync-1756596355421.txt 25 KB 31-08-2025 04:55:55 File:error-sync-1756614480046.txt 30 KB 31-08-2025 09:58:00 File:error-sync-1756616854913.txt 21 KB 31-08-2025 10:37:34 File:error-sync-1756638623482.txt 12 KB 31-08-2025 16:40:23 File:error-sync-1756639451332.txt 17 KB 31-08-2025 16:54:11 File:error-sync-1756652104368.txt 4 KB 31-08-2025 20:25:04 File:error-sync-1756653367478.txt 6 KB 31-08-2025 20:46:07 File:error-sync-1756704617631.txt 12 KB 01-09-2025 11:00:17 File:error-sync-1756802293749.txt 18 KB 02-09-2025 14:08:13 File:error-sync-1756824621856.txt 30 KB 02-09-2025 20:20:21 File:error-sync-1756881547437.txt 9 KB 03-09-2025 12:09:07 File:error-sync-1756910518609.txt 22 KB 03-09-2025 20:11:58 File:error-sync-1756914122579.txt 32 KB 03-09-2025 21:12:02 File:error-sync-1756945880430.txt 17 KB 04-09-2025 06:01:20 File:error-sync-1756956775316.txt 19 KB 04-09-2025 09:02:55 File:error-sync-1756970167229.txt 6 KB 04-09-2025 12:46:07 File:error-sync-1757001011892.txt 11 KB 04-09-2025 21:20:11 File:error-sync-1757001024107.txt 29 KB 04-09-2025 21:20:24 File:error-sync-1757046224475.txt 16 KB 05-09-2025 09:53:44 File:error-sync-1757046230938.txt 30 KB 05-09-2025 09:53:50 File:error-sync-1757057610720.txt 19 KB 05-09-2025 13:03:30 File:error-sync-1757081977371.txt 26 KB 05-09-2025 19:49:37 File:error-sync-1757093018785.txt 148 KB 05-09-2025 22:53:38

I have no idea what to do other than going back to chrome where things just worked and I didn't have to spend hours looking at forums for solutions that do not work...

here's a screenshot from the last txt file

Yesterday I only change the photo in my Firefox profile. Today I can't log-in to synchronize my account. When I click on "Anmelden" (German for "log-in") at the top right corner, a new tab opens, I can enter my e-mail adress, klick onto the button "Anmelden oder registrieren" (German for "log-in or register") it fades out and nothing else happens. I can access my account here as I logged in to send this message. What is the issue? How can I start synchronizing my account again? My Firefox version is 146.0 Thanks in advance, Chris

Is there some way to open all tabs on a synced device. I have the list of tabs showing in the sidebar. However, the instruction: "While viewing synced tabs in Sidebar, right clicking on device name allows you to open all tabs from a device at once." does not work. Right clicking does nothing. Version 147.0.2 (64-bit) in Windows 11. Thank you.

Hello, After performing a clean install of the OS, I logged in to my firefox account. But it is not syncing the passwords. I tried installing firefox to my phone, also not syninc. I think btw, it is syncing but my passwords are not there. Here is the log: https://pastebin.com/DH0wuERM Any help appreciated, because there were more than 200 passwords there. Thank you

I've synced all my data (including add-ons, passwords, bookmarks, etc) to my firefox binded account on fedora linux then change my linux distro and re-setup firefox on Manjaro KDE, login and etc

found out that everything synced but my previous add-ons and open tabs are gone for good I've so many opened tabs are my custom add-ons settings on so many add-ons for personal preferences are gone

I've faced this many times but I thought somehow these days firefox might have fixed these issues but i'm so sad that all my important data are gone :(

I'm using firefox only just for sync+privacy for hassle free setup again and again over many devices otherwise i prefer tor for much anonymity and privacy

PLEASE, YOU GUYS CONSIDER WORKING ON SYNCHRONIZATION FEATURES SPECIFICALLY <ADD-ONS> AND <OPEN TABS>

thanks for reading and pl igonre my english errors

I have 3 devices connected to Mozilla account, 2 smartphones and 1 PC and NONE of them are syncing properly, bookmarks sync perfectly and everything else fails miserably. Some part of history does sync but nowhere near the full history. Syncing of open tabs is *completely* broken.

Everything is gone, I have had to reinstall windows 4 times in the last week with a new PC and now all my sync data is gone...Chrome remembers everything fine and Mozilla did remember everything until this install and now its not syncing anything.

If this stuff is gone so am I.

Have tried logging in with my google account, tried logging in with Moz account, tried sync button over and over tried restarting, tried uninstalling and reinstalling and manually deleting all the folders STILL NO SYNC DATA AT ALL.......

I reinstalled Windows and downloaded the browser again. I logged into my account, turned on synchronization, but none of the data was synced. I am absolutely sure that synchronization was enabled on my old browser. I tried turning it off and on again, but nothing helps. Please help me get my data back!

I recently switched to Linux on both my laptop and desktop computers, and I have started having an issue where after closing Firefox, the process does not end fully, leading to a Firefox crash notice after a minute or two.

This seems to only happen when I have sync turned on. It always says "syncing..." and never finishes, and logging out of my account or turning sync off fixes this problem. However, I'd really like to be able to use sync across my two systems.

My laptop is running Pop OS, and my desktop is running CachyOS. Making a new account fixed this error for a few days, and now it is happening again.

Here is my newest crash report: https://crash-stats.mozilla.org/report/index/9adbdc82-3cfa-49b7-8bad-e6e590260319

The Firefox browser I was using failed to back up the synchronization data of the domestic version due to negligence in reinstalling the new version. Starting from May 24th, after logging into the domestic version account, data synchronization cannot be achieved. (Currently, all downloads automatically redirect to the international version, and the login account is also the international version account. However, the domestic version data was not backed up before, and it is necessary to log in to the domestic version again to back up the data.) . Is there any expert who can offer a solution? The data of eight years has not been backed up. Urgent

Hi,

I changed my password in my Mozilla account and now I can no longer sync my firefox for android.

I scan the QR code and on my android screen proceeded normal and asking me to confirm but in my desktop I get an error.

"General application error Something went wrong. Try again later."

I also tried in safe mode with no luck.

What to do now?