Diễn đàn hỗ trợ Firefox

Firefox crashed with many open tabs. I went to History > Recently closed tabs > Reopen all tabs, clicked. Nothing. The list showing only very few of the tabs I had open, but none of them are restoring anyway.

I lost all my bookmarks after the Nov 2025 update for Firefox. Couldn't find the backup file - not sure if Mozilla backed up the bookmarks before the update! If yes, please share path to find backup.

Today I closed Firefox as usual. It wrote recovery.jsonlz4 and recovery.baklz4. (Sorry if I’m missing some details, I’m just a bit upset.)

On the next launch, it didn’t show a window (most likely due to gWSL). I knew that after the next exit it would rewrite the session files, so I backed up .mozilla. (At that moment I didn’t realize recovery.jsonlz4 was already overwritten.)

I killed Firefox and WSL, restarted, restored .mozilla, reopened Firefox — and it rewrote recovery.baklz4 with an empty recovery.jsonlz4. The session page showed nothing. I panicked, because my previous .mozilla backup is very old.

I found out there may be a way to recover if I don’t launch Firefox before copying recovery.baklz4 to recovery.jsonlz4. So I closed Firefox, restored .mozilla again, checked that the .baklz4 file was larger, copied it over the .jsonlz4, and opened Firefox. It successfully restored everything.

Why do I need to manually back up session files? Could they be versioned, or at least not replaced by an empty session?

If the only tab is about:sessionrestore, that usually means something went horribly wrong, and it shouldn’t overwrite the previous session.

Relying on third-party extensions doesn’t solve the problem. Replacing a valid session with a blank one leads to data loss.

As you probably understand, this isn’t the first time I’ve lost data because of this behavior. This time I managed to save it, but previously I didn’t know these steps and lost my tabs.

Dear Support Team,

I am writing to request assistance with an issue I encountered after a recent Firefox update. After opening the browser, an automatic updat led to making all of my bookmarks, saved passwords and website data disappear. The profile I was using had been active for over two years and contained important information that I now cannot access (it wasn't a profile I created myself, I just used the browser normally).

I have already tried several troubleshooting steps, including restoring previous profiles, checking the profile folder, and attempting to recover data from backups. Unfortunately, none of these attempts have been successful so far. The about:profiles website tells me my old profile does not exist but in my Firefox folder, there is a (profile?) folder from 2023 which contains only one file.

Could you please help me recover my previous Firefox profile or guide me through any additional methods that might allow me to restore my lost data?

Thank you very much in advance for your support.

Kind regards, Sophia

Whenever my laptop starts up,firefox with all of my tabs always starts up with it. When i rose up earlier in the day and started up my laptop firefox with all my tabs opened up as normal,but this evening everything is gone. I had at least 20 tabs open and they were all important. There was no option to recover the tabs and this isn't the first time this has happened,this is at least the third time that this has happened after the last year and a bit. This is incredibly annoying and frustrating. Is there even any point in asking the community how this can be resolved?

Hallo mein firefox hatte pobleme weshalb ich es neu installiren musste seidem werden mir nicht mehr die passworter und lesezeichen angezeigt ich wollte fragen ob sie mir dabei helfen können.

After most recent update all my bookmarks and passwords disappeared and I cannot seem to recover them. This is extremely frustrating. Has anyone else had this happen? I tried using the recovery process but it did not work.

I recently upgraded Firefox to 145.0.1 but all my bookmarks are missing. I have a backup file. I tried to restore the bookmarks by opening the Library & selecting Restore (under Import & Backup), then clicking "Choose file". However, nothing happened; no further pop-up window. Please advise.

I was trying to remove the suitcase icon from the Firefox icon on my dock and I ended up erasing all of my history, saved passwords, bookmarks, etc. Is there anyway I can restore all of this information? There are no profiles listed in my browser.

Just updated my Firefox. I had a huge tab group saved, and tons of bookmarks. I've been using firefox for months, I didn't have an account signed in on the browser though. I updated it and it had to restart, and everything was gone when it reopened. I even clicked that it should reopen tabs after restarting, but it just opened to tell me to make a profile. It told me that they just introduced profiles, and it put me on profile 1, which looked brand new. No browsing history whatsoever, no bookmarks, my background that I set is gone, and I cannot find anythign at all. I had over 50 bookmarks, inclyding very imprtant links for a final paper, and I'm genuinely so upset. Multiple of those bookmarks were things for me to go back to read/watch later and I will literally not be able to find them. If anyone has any tips at all, I'd love them. I am so seriously upset right now and I'm just hoping its possible for that to come back.

Hi All,

My laptop got damaged this morning and now that I am logging into Firefox with my new laptop its not syncing anything. Many years of bookmarks and stuff is just gone. Is there any way to get it back?

Kind Regards

Mozilla, in their infinite wisdom, sent me a note about something new in firefox, by displaying it in a new instance of Firefox.

It wasn’t until I closed my normal session, that I realised a new instance of firefox was also running, and shut it down on.

In shutting the new instance down after my usual session, it overwrote all my normal tab settings🤬

Q1. Are my normal tab settings recoverable? Q2. Why did Mozilla think it a good idea to open a new instance of Firefox to send me information, rather than simply open a new tab.

NB This is in Windows 11

To make a long story short, since this morning, Firefox had no more profiles after an update. The one I am currently using, which came to exist this morning and only contains information from this morning, is the only one that shows up when I try to follow the recovery instructions. My internet history beyond today seems to no longer exist. How do I recover my bookmarks and passwords? Or are they gone forever?

Mozilla recently did some updates to Firefox.

I have just started my computer and went to Firefox and then to bookmarks, but they all have gone.

Anybody have a similar situation and how did you resolve the problem so as to restore all of your bookmarks.

Thanks in advance.

Bob R