Diễn đàn hỗ trợ Firefox

I signed into my firefox account on my wife's computer and now ALL of her bookmarks, passwords are mixed in with my data. I've signed out of both accounts on that computer. I've signed out and relogged in on my computer. This is not a temporary issue. All of her data is somehow in my account. This seems like a MAJOR security flaw of the software. Were both using Windows 11 computers.

I have a desktop and a laptop on firefox. I am selling my laptop so i cleared history and deleted all bookmark history.

To my horror, even though i remember i have signed out of mozilla account on the laptop firefox, on my desktop firefox all the bookmarks including bookmark folders are gone. Thankfully, i have a fairly recent backup of firefox userprofile file so i restored them.

However, to my horror once more time, I realize now firefox sync automatically deletes my bookmarks everytime it syncs so i have to turn it off.

How can i make firefox sync to treat my current bookmarks as the latest and stop deleting them?

"This profile was previously synced to a different account To keep your data organized and secure, each Firefox profile can only be synced to one account. To sign in using xxx@xxxx.xxx, create a new profile."

So I deleted my old mozilla account since I abandoned the email that it was linked to, but when I tried to sync with my new account I get this. Is there anyway to do this without having to make a new profile?

I tried making a new profile and copy and pasting my profile into the new one, but still get the same pop up. I guess there's something in my profile that says it's been synced before, is there anyway I can find that and delete it or change it?

I have changed operating systems from windows to linux mint. I made sure to sync my profile before uninstalling, but now the profile looks to be empty. there are no saved passwords or bookmarks. This worked when I changed between different windows devices last year, but this time it seems stuck. I will check on a windows device when able, but in the meantime, are there any other ways to troubleshoot this?

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

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 just wanted create Account recovery key to keep my account more secure. So I did that + updated my password.

Now when I open the browser, it says account disconnected and that I need to create a new profile. I did that, but it started syncing from old chrome account with old extensions, bookmarks etc. Plus bookmarks from my phone.

I try to sign in and create new profile with the original profile settings that I want. But it keeps saying "This profile was previously synced to a different account". And now that I saved the bookmarks and made a third, fourth profile. Those don't work as it wants me to sign in. Only the 2nd profile that Firefox made me create which has the old extensions, bookmarks etc. It is missing a lot. So now I am just stuck in create profile loop. And cant use the one I want because I wanted more security? Do I need to uninstall and install again, would that help? I wish there was someone to talk to help me. I just want to use my original profile that I used earlier today to update the security settings.

I uninstalled Firefox on my computer and reinstalled it, but when I logged in, the account couldn’t sync, it was as if the sync couldn’t retrieve any data from the server. Nothing happened at all.

On my Android phone, the data is still there, but when I tap “Synchronize now,” nothing happens either. I’ve tried signing out and signing back in multiple times, but still nothing works.

I also tried switching to a different computer and a different internet connection, but it still didn’t work.

What should I do now?

I reinstalled the operating system, so to speak, changed my device. I clicked the sync button and it worked. I reinstalled the operating system and reinstalled the browser. I logged in, nothing happened. I rebooted, nothing changed. I clicked sync, everything was the same. Where are my bookmarks and passwords?

Firefox updated to the latest version and it lost everything. All my saved passwords are gone, all my bookmarks, data, etc. It said I could sign in with my account and it would sync them and bring them all over, it didn't. I can't use the original profile because it says it's outdated, I don't even know if it's the correct profile anyway. What am I supposed to do?

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 Mozilla Support Team,

I am writing to request assistance with recovering my Firefox Sync data.

I recently reset my PC and after reinstalling Firefox and logging back into my Firefox account, my bookmarks and saved passwords are completely gone. I believe the sync may have overwritten the server-side data with an empty local profile after the reset.

Account email: [edited from public] @gmail.com Approximate date of data loss: 02 25 2026

I had been accumulating this data for approximately 1 years and it is very important to me. Could you please check if there is any backup of my sync data on your servers that could be restored?

Thank you for your help.

Hi! I recently lost my old laptop and I'm trying to setup my new laptop without a backup. I was logged into my mozilla account on my old browser before I lost it, but I'm not seeing any of my old tabs, bookmarks, and extensions from my old browser syncing to my new browser. Is there anything I can do to retrieve this data without having access to my old laptop? Thank to anyone who can help!

Anybody else having issues with this feature? It had been working well to send tabs from my tablet and phone to my desktop computer, which I have been doing due to the lame way that FF uses for filing bookmarks into folders on the mobile devices.

A few days ago I started seeing "unable to send" popping up after a delay, instead of "tab sent" which typically appears immediately. Sometimes, the tab is sent even though it says it wasn't and sometimes it will send it after repeated attempts, and other times it doesn't. My wireless network and ISP connection are high speed and reliable.

So far, the problem only appears when trying to send from mobile to desktop. Sending from the desktop to mobile seems to work fine. The problem started while using 147.0.4 and persists after upgrading to 148.

Lately I installed a new PC, and tried to download FireFox and sync my data. But my data seems like a few years ago, not as new as another PC I have now. I'm sure I have logged in with same account on them, how's this happend?

I wanted to synch my current settings in my browser to import them on my new laptop. When I tried to login to my account, I the message from the attached screenshot appeared. So I created a new profile, got my stuff back to what it should be and then deleted the "new" profile. But now every time I try to get into the correct profile and login into my account, I still get the message from the screenshot. I never ever synched with another profile before and never had an issue in the past. Right now I am rather pissed off, because I lost atleast some of my bookmarks during this whole ordeal.