I-Firefox Community Forum

I lost all bookmarks on or about June 29, 2026 after doing a Firefox update that asked me to create a profile when I'd never had one before. I have not been able to recover them.

I saved and closed a few tab groups about a month ago and now they're no where to be seen. Nothing is in the down arrow on the right and I don't see any groups searching through history. The text when I closed them said I could re-open them at any time. Where are they?

Subject: Firefox Sync appears to have erased all bookmarks after setting up a new Windows installation

Hello Mozilla Support,

I believe I have encountered a Firefox Sync issue that resulted in the loss of my entire bookmarks collection.

Here is exactly what happened:

I have been using Firefox Sync for several years without any issues. This was not my first Windows reinstallation. I have restored Firefox through Sync multiple times before. Firefox Sync had always synchronized bookmarks, passwords, history, extensions and open tabs correctly across my Windows PC and Android phone. I had approximately 350 bookmarks, organized into folders. Timeline Yesterday I performed a clean installation of Windows 11. I installed Firefox 152.0.5 (64-bit). I signed into my existing Firefox Account. I did not immediately enable Sync, so nothing was synchronized at that point. Today I enabled Sync and waited for the synchronization to complete. Passwords synchronized successfully. Browsing history synchronized successfully (it took a little longer). Extensions were restored successfully. Bookmarks never appeared.

Immediately after noticing this, I checked Firefox on my Android phone.

At first, one of the bookmark folders still showed that it contained more than 300 items (I saw the item count), but when I opened the folder it was completely empty. After synchronization finished, all bookmarks disappeared from both devices.

Additional information Browsing history is still present. Saved passwords are still present. Extensions are still present. Open tabs synchronization continues to work. Bookmark synchronization is enabled. I am signed into the correct Firefox Account. The second local Firefox profile is empty. The automatic bookmark backup now contains only the current state (7 items), indicating that the original backup has already been overwritten. The current profile contains both places.sqlite and places.sqlite-wal. The only Sync error log is related to a temporary DNS lookup failure (NS_ERROR_UNKNOWN_HOST) and contains no bookmark synchronization errors.

Because history, passwords and extensions synchronized correctly, this does not appear to be an account or authentication problem.

What concerns me most is that I briefly saw the bookmark folder still reporting over 300 items on Android before it became empty. This makes me suspect that something went wrong during bookmark synchronization rather than the bookmarks simply never existing on the server.

Could you please advise:

Is there any server-side recovery or investigation that can be performed for Firefox Sync bookmark data? Are there any diagnostic logs that I can provide? Is this a known issue with Firefox Sync after connecting a newly installed device?

I would greatly appreciate any assistance, as this bookmark collection had been accumulated over many years.

I have a Sync error log available: error-sync-1783454370913.txt

It only contains a DNS error related to tabs synchronization: NS_ERROR_UNKNOWN_HOST

There are no bookmark-related errors in the log.

Thank you.

I utilize a website called Twinspires for wagering on horses. It has a video popup (no sidebar tabs) that one can engage to watch the race outside of the Firefox browser. I quite like this feature. That said, I keep quite sidebar tabs saved as I use that feature to pin and then revisit websites that I want to spend more time on. Problem: If the browser closes on its own or other issue, it doesn't close the video popup. So when I restart the browser it "thinks" that video popup, with no saved sidebar tabs, was the last browser open so I lose all my saved sidebar tabs. If everything Firefox would close when the browser does, one could restore all tabs under history like one would normally do. Is there a setting so everything Firefox that is open closes when the browser does? Thank you.

plz guys help me my eyes hurt so bad because of this

every time i open firefox for pc, a white flash appears very quickly

i tried every thing ai told me to, but still

i cant even record it it doesnt appear in video

Roughly one third of my bookmarks all changed to sites I have visited recently. They still have the same labels, but when I click on them, they just take me to some random site I've visited recently.

Since the blow up User Id's and Passwords to various sites no longer pop in by clicking in the requestors. I was able to retreive my UIDs and Passwords but I now have to obtain them from the Hamburger, Passworkds, etc. for each site I visit that requires a login. Twice for each site...one foe UID and again for Password. That is currently the worst problem I am facing but other damage was done with the update.

Suggestions for fixes are welcome.

- Orph

Не працює розширення Firefox multi account containers, firefox не бачить моїх налаштованих проксі, контейнери відкриваються не під тими проксі які налаштовані в них

I am using Windows 11 on both my desktop and laptop. I began using vertical tabs a ways back. On my desktop I am able to scroll through the active vertical tabs with the mouse. But, I am unable to scroll the vertical tabs on my laptop. I have compared the Firefox settings on both computers and have been unable to find any settings that are different which could be applicable.

Why do I continue to receive a message from Firefox after creating a New Profile?

Firefox This profile was last used with a newer version of this application. Please create a new profile. OK

A new profile PERSONAL #2 was created following the Steps to Create a New Firefox Profile.

What did I do wrong? how to correct, so that I stop receiving the error message?

Not limited to youtube

All videos on any site will load properly however they will not play. Can skip around and see frame by frame but the video will not play

This problem has never happened before. This happened in the last few minutes. The whole screen suddenly went blank while I was trying to find out today's weather. I am suspicious of malicious interference with my computer. Any help you can give me will be reassuring.

I can't open, delete, uninstall or update my Firefox on my laptop???

I dont have much Ram space on my computer - but am working on expanding it.

Yet, still - I can't open, delete, uninstall or update my Firefox on my laptop