Diễn đàn hỗ trợ Firefox

This first happened a few days ago and I successfully recovered my book marks from backup. It has now happened twice more. I can't be sure, but it seems possible that this happened each time after installing recent updates. Note that my recent history has also vanished.

1- Firefox shows I have windows 10. Not so. I have windows 11 home, version 25H2. This may be problem that causes the issues. 2- Since Update months ago, profiles, bookmarks and passwords disappear constantly only for me to replace manually the bookmarks and passwords to disappear over and over again. Don't need multiple profiles just one that works as in the good old days. Used it for years but cannot find help and ready to delete and just use microsoft edge. Totally out of patience. ?????????????????????????????????????????????????????????????????????

This is a recurrent problem. I'm online with many tabs open, when all of a sudden they disappear and when I try to recover them by going in "history" [using the three lines at the top right of screen], and then selecting "recently closed tabs", and then try the "restore tabs", nothing happens! Previously, this had worked to offer me a way to reopen those tabs one-by-one, but now it doesn't restore anything. ALSO, I used to be able to shut down my computer, wait a few minutes, and then restart it, and would be offered a "restore session" option when the computer restarted, but that didn't happen today even after trying this twice.

I was once shown how to restore tabs by going up to the top right of the screen, but cannot remember how to do this. Can you please help me from loosing tabs, and my mind? Thanks.

There was an electrical outage and I lost all of my settings,pictures,bookmarks,documents,home page,every thing and I can't get it back....I have tried everything I know (which isn't much) to try and get it back,like a restore,downloading Firefox again thinking that would bring everything back,but nothing I did worked...I really need to get all of that information back up and running again as I have extremely important messages and emails I just can't afford to loose. How can I get my home page back, along with all my other settings? It is so important that I get all of it back !! Can an electrical outage erase everything off of a computer and if so is it lost for good or can I get it back? Please, Help!! Thank you :)

Nach dem letzten update ist alles anders. Gespeicherte Ordner,, Lesezeichen, gesamten Erscheinungsbild ist weg bzw. nicht schön. Ich möchte meine alte Version wieder zurück.

After a recent Firefox update, all of my saved passwords disappeared.

I checked my Firefox profiles and found that the current `logins.json` and `logins-backup.json` files were newly created on August 30, 2026 and contain no passwords.

However, in the older profile data I still have:

• `logins.db` — approximately 480 KB, modified August 19, 2026
• `key4.db` — approximately 288 KB, modified August 18, 2026
• `signedInUser.json`
• `storage-sync-v2.sqlite`

I opened a COPY of `logins.db` using DB Browser for SQLite. It contains:

• 392 records in `loginsM`
• 5 records in `loginsL`

The records clearly contain my saved websites in the `origin` field.

The table columns are:

`_rowid_` `id` `origin` `httpRealm` `formActionOrigin` `usernameField` `passwordField` `timesUsed` `timeCreated` `timeLastUsed` `timePasswordChanged` `secFields` `guid`

The `secFields` values begin with:

`eyJhbGciOiJkaXIiLCJlbmMiOiJBMjU2R0NNIn0`

Unfortunately, after discovering that my passwords were missing, I also reset my Mozilla account password. I understand that this may have affected the server-side Sync data.

My main question is:

Since the 392 encrypted login records are still physically present in the local `logins.db`, is there a supported or technically safe way to recover/decrypt those records and restore them to Firefox?

I still have the older `key4.db` and have preserved copies of all of these files without modifying the originals.

I am currently also attempting Windows File Recovery to look for an older deleted `logins.json`, but I would especially appreciate guidance on whether the surviving `logins.db` can be used for recovery.

Bill

Issue occurred on September 6:When I was running a game and updated my graphics card driver, Firefox was running in the background. My PC went completely black and became unresponsive, so I had to force‑restart the computer.

After rebooting, Firefox reverted to a brand‑new fresh‑install state. All my browser settings, login status, local profiles, browsing sessions, hundreds of open tabs and my categorized tab groups disappeared, only the welcome startup guide showed up.

I logged into my Mozilla account on my Android Firefox device. Some browsing history was synced back. However, synced history cannot restore the original tab session back‑forward page history, nor my manually sorted tab groups. All browser preferences, theme and language settings are also lost.

I originally had 4 separate local Firefox profiles on this Windows computer, isolated from each other for different work purposes. Only one profile was logged‑in to my Mozilla account and could partially sync data. The other three local profiles are completely gone. Those extra local profiles were NOT signed into any Mozilla account and were never synced to cloud storage.

In my Mozilla account’s connected devices list, there are two entries both belonging to this same computer: “MARSHAKK” and “Firefox by Administrator on MARSHAKK”, which correspond to my Firefox instance before and after the crash.

I cannot understand the community help articles about session recovery, and I’m unable to locate or restore my old local Firefox profiles and lost tab sessions by myself. Please give me assistance.

Seit dem letzten Update auf 153.0.1 sind alle Lesezeichen aus der Lesezeichenleiste verschwunden. Die Wiederherstellung aus der .json- Datei in meinem FF-Profilordner, in dem sich die 12 Einträge befinden funktioniert nicht. Wie kann ich die Lesezeichen wieder herstellen? Ich habe keine Admin-Rechte.

Leider hatte ich FF auf automatisches Update eingestellt, das hab ich jetzt ausgeschaltet.

I accidentally deleted my old Firefox beta And I need to recover my settings bookmarks and data etc by logging in how do I do that immediately? I'm trying to recover my old Firefox beta account how can I do that immediately

What the hell has happened to the support environment? I've tried to resolve two big issues recently, and I can't find anything of value. I've lost the ability to pin an extension to the toolbar after losing my entire profile on this computer, tabs and all, using Tab Manager. I can't find a way to recover the profile, so I've given up on that. Now I can't get my most-used extensions back on the toolbar.

After closing the records in the window, how many windows can be kept now?

I had 6 windows open before closing my browser, but only 5 were automatically restored after reopening it; there are no other windows in the closing history either. What happened? There are no other windows in the closed history section either. What's going on!?!?

I have been using Mozilla Firefox on my mobile phone or PC since 2015. So, after so long, I found the Gmail that I used to log in to Mozilla from 2015 to 2018. Now, if I log in with that Gmail, will the previous history or data be restored or will it be Mozilla's?

okay firefox crashed ive been using it for 3 years on steam os . it ussually crashes normally if that makes sense but this time it went poof . it saved one window containing all my browse history bookmarks dverything , i succsessfully transfered the crashed windows to kate windows containing 2.1 megabytes of extremely important data - riht before it crashed again. i am extremely frustrated , it erased all knowledge of me ever being on firefox erasing history bookmarks log ins everything. it is extremely imperative that i get these windows back . ive been battling with ai to fix the problem my last resort is you guys the ones who made firefox. id like to think you guys built something for this exact occasion . please help, you are my last resort and i would be overjoyed if you can help , thank you ,

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