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Something very bad happened to me today (11/3)....

Firefox 144.0.2 was installed on 10/30/25, and everything has been fine until today. I don't know why or how, but ALL of my OPEN tabs (of which I have many--and have it fixed so they always re-open when Firefox starts), ALL went away.

In reading conventional steps to recover such from sessionstore-backups, those instructions sounded straightforward. However, even though ALL FIREFOX PROCESSES were ended, I could not copy the contents of the sessionstore-backups folder nor could I delete anything--EVEN THOUGH I am the owner.

Even after providing Admin perms.

I could get rid of profiles.ini, which initially proved diasterous, because then Firefox thought I was brand new, so ALL of my passwords saved through Firefox these many years, went "poof".

Fortunately, I was able to get that back, but I still cannot get all of my tabs back, and conventional instructions to do so aren't working.

After recovering from my heart attack for initially losing my passwords, I am breathing a little better right now, but it sure would be nice to get all of my open tabs back again. I don't know why I am not able to manipulate the files within sessionstore-backups. I think if I could eliminate the files in that folder EXCEPT for upgrade.jsonlz4-20251027123126, which possesses a 10/29/25 date, these should be the open tabs just before the 144.0.2 installation, and all should be right with the world, once more.

I have performed/examined many steps offered under this category, but most assume I can copy them elsewhere for safe-keeping and/or removing all but the one I want Firefox to "use". Because something is preventing me from doing this, though, I am being stymied in what ought to be the solution. As a test, I was able to copy files from a much older profile--so I can prove the basic steps SHOULD HAVE worked. Unfortunately, I cannot do the same with THE (more recent) folder in question. I can't get rid of parent.lock, either (and I have ensured no Firefox processes are running via Task Manager).

Repeatedly.

Something else is at work, here. Any help or assistance from community experts would be most helpful.

Thanks very much in advance.

-MG

There are times that when I open firefox that some of my tabs that does this weird thing where my tabs from the previous session that I left doesn't load up, from what I see is a blank tab that doesn't access the sites I left. It's been twice since I encountered this and I can't replicate the issue. When it happens I try checking out the recently closed tabs or window it doesn't show the ones that didn't show up.

I have years of bookmarks that have disappeared and my history is missing. Firefox opens with the tabs that were open when it shut down. I really want my bookmarks back.

Hi

Lets say i have 100 tabs open in my session. I mistakenly open a new window with one tab. After closing this window and starting firefox again, it starts with this one tab, so i have lost all my previously opened tabs. Is there a way to get those back?

Thank you very much. Dimitris

Today I opened Mozilla at my laptop. It malfunctioned (videos froze, pages did not fully download), so I closed the window and after a couple of seconds I reopened it. My previous session was gone. I read your articles regarding this issue, did what was described there, but nothing has changes. I lost everything! Job videos, hobby pages - everything! A couple of pages can be restored via history, but that's it! I didn't do anything special before closing the window!

I was on a website and noticed I was signed out, so I went to log in, but the browser did not display the username/password like it usually does. I clicked on the hamburger menu to go to my passwords and I noticed that it said "Account disconnected" at the top. I figured this was the issue, so I clicked it to log in. After going through the forgot password steps, I got logged in to Mozilla. Firefox then prompted me if I wanted to save that password and I clicked yes. I then went to the password manager and the only one listed was the Mozilla password that I just saved. After some digging, I found there was a logins.json.corrupt file in the profile folder. I tried renaming it to logins.json but that does not work. I tried viewing the corrupt file, but it was not legible.

Is there any way to recover the passwords or are they gone for good?

As of yesterday, Oct. 14, 2025, everything in my Firefox Bookmarks and History is gone. This is the message displayed: "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem." I have tried to recover them by different suggested means, but it would appear there is NOTHING to recover. Everything in Bookmarks says EMPTY, and I can no longer save any new Bookmarks, it just not allowed. How and why did this happen, and what am I supposed to do? I had hundreds of things Bookmarked, many of them were important to how I run my business, and now are seemingly all gone. This is very upsetting and would appreciate Mozilla getting this straighten out. I need and explanation and resolution.

Firefox just updated and ALL of my bookmarks are gone. There is NOTHING. WTF? I am not a computer person so reading help articles just makes my head spin and of course I can't reach a real live person at Mozillabold text. Can anyone help?

Hello, I reinstalled Firefox and am unable to recover my bookmarks and other data. Before the re-installation, I manually backed up my data, but when I try to restore from the backup, it does not work. All my bookmarks and previous data are still missing. How can I fix this and recover my information?

144.0.2 firefox version has an issue with bookmarks keep, they keep dissapearing & i have to use firefox fix from uninstall option to restore. unable to use email links as it requests that i close firefox window before it can open links, when i do this all bookmarks are gone & i then have to start again. I'm running win11 25h2 with all updates done both chrome & edge are not causing issues

Hi

I've just booted my machine and opened Firefox, only to be presented with a completely fresh install.

All my settings, bookmarks and history gone. It was fine yesterday when I closed it and powered down.

I'm running Kubuntu, I've checked the .mozilla folder and nothing...it's like my profile has just been overwritten.

Not happy at all, I'm starting to dislike Firefox.

Can anyone offer any help or advice please?

Thanks in advance.

When I opened Firefox today, all my bookmarks are gone and a message about a Firefox is opened by another application is showing. None of your online suggestions helped. Is there a hidden way to restore Firefox to another version?

I quit Firefox and when I restarted it it said it was a new version! It said something about restoring but I assumed it was just restoring my prior pages! DAMN! I can't even find a place to import bookmarks!

I am so angry I could chew nails!

iMac 2013 Catalina 10.16.7

Where are my bookmarks? Everything is gone with the update, and you didn't warn this could happen. Is there a way to recover the bookmark file? Profiles does not help for there is no new profile there. I NEED THE BOOKMARKS FOR WORK!!!