Firefox Community Forum

Per Updates critically important open tabs were no longer accessible following the Updates in question. I need to recover the missing activity-chronic or request that the unfinished activity up to the point of Update be retrieved.

and how do I fix it so I can restore previous sessions I accidentally close? I accidentally deleted all prior data from whatever version of Firefox I was using the other day (I didn't have a profile as far as I'm aware) removing all saved passwords, bookmarks, history, and apparently the Restore function.

2021 Macbook Pro Sequoia 15.7.4 Firefox 152.0.3 (aarch64)

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 ,

                 v

I had two Firefox tabs open in my lower task bar. I closed out one but it was the wrong one. The one I unpinned has all of my tabs, history and book marks. I can't figure out how to recover it.

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 had two different firefox browsers yesterday. I deleted one but all my passwords are gone from the other browser. When the firefox browser got uninstalled it created a backup on my desktop called bookmarksback up. how can i move that file into this new firefox and how can I retrieve those passwords?

I was switching computers and created a backup file. The type was html oddly. I tried to restore this backup on two different computers and both times it fails during the restore process without presenting a useful error message.

I can only guess that the file is corrupt, but it is only a guess since the error message is useless. It also seems strange that the backup didn't produce any errors (manual backup). Any suggestions?

I used Firefox yesterday. My settings are to open Firefox with tabs restored - but all my tabs (as they were yesterday) are missing and when I go to history, the option to restore a recent window is greyed out. The option to restore a previous session doesn't even seem to be there.

I notice in task manager I have 15 firefox tasks. Could my window from yesterday have opened somehow in the background, but not be visible to me anywhere?

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

Hello! I am having trouble restoring my old Firefox profile after migrating my system from Windows 10 to Linux (Fedora). I have a backup file in .html format that is 197 MB in size (originally created on Windows). When I try to select and restore it using Firefox's built-in recovery tool, it throws an error: "Something is wrong with this file. Please try again with a different file." What I have tried (and what didn't work): Moved the file from an external drive to the local Linux Downloads folder (the error persists). Tried dragging and dropping the file directly into Firefox (the recovery page loads, but the restore buttons are missing or inactive due to security/script restrictions). Tried renaming the file extension from .html to .zip to extract its contents manually, but the archiver threw a "Not a zip archive" error. The built-in recovery script fails to process a 197 MB HTML file, likely due to size limits or memory handling on local files. Could you please advise on how to properly handle and restore such a large backup file or extract my data (passwords, history, bookmarks) from it on Linux? Thank you in advance!

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.

Firefox has complained for sometime that my profile was created with a newer version than what I was using. I'd click OK, and go about my day. After about a month, I decided to upgrade so it would stop bugging me. When I did, my old profile did not merge, but was deleted, and now I have lost all of my passwords and bookmarks. How can I restore them when the profile is empty?

I removed the solid-state SSD drive from my physically-broken Windows 10 HP laptop and connected it to my new Windows 11 HP laptop using an external adapter, wanting to move the contents to my new machine. But already I find that only about 3/4 of my bookmarked browsing favorite sites and document files are among the items that I can find on the old, externally-connected "D" drive (D:>USER>OWNER>FAVORITES). I tried visiting some of the bookmarked sites and hitting "bookmark this page" for each, but then none showed up on my new Windows 11 machine's firefox browser bookmarks sidebar. Perhaps they are being put elsewhere because I am opening these sites from my old drive??

I probably need to first understand if and how much that the two drives are still operating separately, so not cooperating with each other in the way I had hoped. I know next to nothing about any of these things but have used the Firefox browser and documents files for many years without too many issues.

After a update 154.0.1 and 155.0.1, 64 byt Firefox dod not keep the open tabs once started, but the bookmarks. After searching in Firefox help, neither I could not find a previous bakup folder, before the update data, so I cannot restore the history it manually, so I do not know what to do. It is quite dissapointing as I had dozens of tabs open for diferent putposes, and now I have no one