Firefox Community Forum

Hi,

2 days ago, on 02.05,2026, I was logged out of all my accounts on every website in Mozilla. My history was erased, passwords not saved, but I'm still logged in. That only happened on Firefox, not the rest of my computer.

I am afraid it was a virus or something - can you tell me why it happened?

This problem has been covered in this forum before. However, the various solutions have not worked for me because it seems my backup previous.jsonlz4 was corrupted. I did exit Firefox normally, but I am not sure because I have been using multiple different browsers in recent months.

This is what happened this morning: my Firefox on Mac OSX was closed normally, and I rebooted the MacBook. Afterwards, I could not restore old tabs because "Recently Closed Tabs" and "Recently Closed Windows" are greyed out.

I tried copying recovery.jsonlz4 from the last folder and putting it into the main folder as sessionstore.jsonlz4, then reopening Firefox. Still have no restored tabs. Here was the surprise, which I do not know how to interpret.

I just checked some files and found this error message in sessionrestore-logs folder:

1770888233416 SessionStore ERROR SessionSaver write() rejected with error: Error: SessionFile is closed(resource:///modules/sessionstore/SessionFile.sys.mjs:424:29) JS Stack trace: write@SessionFile.sys.mjs:424:29 write@SessionFile.sys.mjs:47:32 _writeState@SessionSaver.sys.mjs:375:29 _saveState@SessionSaver.sys.mjs:308:17 _saveStateAsync@SessionSaver.sys.mjs:354:10 saveStateAsyncWhenIdle@SessionSaver.sys.mjs:194:14 requestIdleCallback/<@Timer.sys.mjs:180:15 observe@AsyncShutdown.sys.mjs:570:17

Zniknęły mi zakładki (nie ma ich ani na pasku, ani jak wejdę w zakładki- w ustawieniach i w zarządzaniu zakładkami). Hasła te co były zapisane mam dostępne na moim koncie.

Every time I open my PC I get message - Firefox update available. Ignored it for awhile, the foolishly clicked "update." Got a new "profile" and lost all of my saved and autofill passwords but four. Makes logging in to frequently used sites almost impossible, extremely inconvenient. I do not want a new "profile." Need to recover-go back to the version I had before "updating."

firefox up to date, only 1 profile used used to have aio sidebar, but for the past years sidebar changed & could not save, reorder nor change bookmarks tried 2 newer sidebar plugin & lost all my bookmarks cant import from saved bookmark htlm file nor import from gmail settings (attachement); how to resolve? is there a plug in I shud invest time populating instead of wasting time

Dell desktop running Mint Mate 22. Bookmarks missing about 50% of bootups. Saved bookmarks to both HTML and JSON during an occasion they did appear, when they next were missing attempted to restore them via Library pop-up (Manage bookmarks). I could not determine a path to direct the system to either locally saved file. In Library, selected Restore, which then asks me to choose file, but none of the data fields accepted or acted upon input. re-installed Firefox but same result. Then clicked on the saved HTML file, multiple screens flashed on the display, with multiple items in the tray. The final result was the bookmarks were all displayed as expected, but since the problem has been inconsistent, unknown whether they will display on future bootups.

Wish to have guidance on using the Library pop-up to restore saved bookmarks when they are missing. Perhaps some knowledgeable user could post a step-by-step through the restore process.

So every time the browser crashed or a blackout happens and it forced closed (sometimes the browser is closed normally and it still happens) the next time i start the browser it would show the restore session page. Pressing the restore session would just restore the open tabs and not the tab groups. Because of this i would need to go to the file manager, copy the previous.json and change it to replace the sessionstore. it's kinda annoying. is this problem just me or is this a known issue? also how to fix.

bold text'I am so fed up with these updates loosing my passwords and data, why ? All my settings are messed up and last time it took two weeks to get everything back, why? I give up total idiots for releasing updates that are sub par!

My desktop computer was infected with malware when I was called by a man supposedly from Paypal stating that I has been erroneously charged with over $600 of merchandise and he wanted to get information to refund the money to me. I gave him information (sadly) to enter my computer outfitted with Firefox running on Windows 11. After consulting my bank, they said that there was no way for Paypal to refund the money as he wished to do. Apparently he was infecting my computer while we spoke. I realized that is was a scam shortly after I hung up and shut the computer off. The next morning I took it to our local tech center and they 'cleaned' it. Now I find all of my passwords stored in Firefox are gone. Do you have a way of recovering them?

so i had a bunch of bookmarks saved, and when i logged in today they are gone, replaced with a message For quick access, place your bookmarks here on the bookmarks toolbar. manage bookmarks (link)

so when I use the link I cant restore bookmarks, cant seem to save new bookmarks, and the FAQ section isnt helping, some of the stps they talk about are greyed out in my version, so I cant click on them etc.

Is this a windows 10 issue? Am I the only one having this problem?

Hi, there.

After performing the most recent Firefox update, I was greeted with the "create a new profile prompt", rather than having it open my old one. When going to "about:profiles", ALL FILES in the Root Directory of my old, default profile have the same date as the update, or after. Not a single file is older than that and all my history and bookmarks are gone. The option "Restore Previous Session" was not shown after the update.

PLEASE HELP!!

Thank you.

PS: This happened on a Macbook Pro. All other profiles are the same as they were before the update, having kept all history and bookmarks.

I was gifted with the latest upgrade, and all of my passwords and bookmarks have been lost. I signed in with both of my primary emails, and both are acting as if they are new accounts.

see above... i do not like what ever you did to my firefox opening page yesterday, i lost the top right marker that opened all my bookmarks which i had a bookmark for my email now that is gone so i can not get my email. VERY MESSED UP PLEASE RETURN ME TO MY LAST FIREFOX I AM 85 AND LOST.PLEASE HELP JIM. [email removed]@GMAIL.COM