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Firefox prompted me to update, I hit download, my entire PC froze, I restarted the computer, when I opened firefox again and hit "restore session" it restored a session that I had opened months ago. When I checked my history, everything after that older session had been deleted. All of my history from the past few months has been deleted. I tried a few different solutions from trying to research the problem, nothing so far has worked. The only thing I have found is a session restore error saying "could not decompress file", but I could not find the file it was attempting to decompress. This is the error message I found.

1785894397652 SessionStore ERROR NotReadableError when reading session file: recovery: NotReadableError: Could not read `C:\Users\ansen\AppData\Roaming\Mozilla\Firefox\Profiles\xpnhovd6.default-release\sessionstore-backups\recovery.jsonlz4': could not decompress file: invalid LZ4 header: wrong magic number: `00 00 00 00 00 00 00 00 00 00 00 00' (NS_ERROR_FILE_CORRUPTED) No traceback available 1785894397756 SessionStore ERROR NotReadableError when reading session file: recoveryBackup: NotReadableError: Could not read `C:\Users\ansen\AppData\Roaming\Mozilla\Firefox\Profiles\xpnhovd6.default-release\sessionstore-backups\recovery.baklz4': could not decompress file: invalid LZ4 header: wrong magic number: `00 00 00 00 00 00 00 00 00 00 00 00' (NS_ERROR_FILE_CORRUPTED) No traceback available

Any help is greatly appreciated. I'm one of those people that tends to have way too many tabs open at once due to poor memory, and losing months of tabs and progress is a huge setback. I'm very desperate to get the history and tabs back.

I purchased a new computer and installed Firefox on it when I open Firefox for the first time it had none of my bookmarks, etc. As per the instructions on the Webb, I copied the latest profile for Firefox on my old computer and pasted that profile into the users profile folder on the new computer. For some unknown reason, Firefox is not installing this profile. The profile is approximately 330 MB. So I’m assuming there is a lot of data that is stored in that profile folder. Can you please direct me as to how I can use the current Firefox profile that I have from 8-4-26. Thank you

ich benötige die übermittlung, da das chronic dieses eingestellt hatte: die auffindung der www´s durch das vorgehen bei dem umstellen der mozilla-umsetzung bei der neuinstallation. durch dieses hatte ich die www von einer bestimmten auffindung nicht (ich kann die www gern durchgeben: frau, bdsm, in der nähe, aber ohne kommerziellem hintergrund !).

This started since Firefox 153.0 (Debian package).

When I open Firefox for the first time after a reboot, it opens my latest tab but all the other tabs on that window are lost, and they show as "ghost tabs" as seen in attached image.

No other issue, other windows are preserved properly when I Ctrl + Shift + N

You did updates this morning which annoys me anyway. You do updates too often and at the wrong time of day. After you did updates, everything, all my bookmarks, etc. are gone. It's a blank screen.

I lost all bookmarks after running a Firefox update near the end of June. I have not been able to recover them. I believe I deleted my original profile inadvertently so not sure if there is anything I can do to recover them. Suggestions?

gerald.r.vargas 4. Aug. 2026, 08:23 GMT-6 Hi, this morning for some reason all the tabs I had open couldn't been loaded. Refreshening the page didn't help either. So I decided to shut down and restart my laptop.

Unfortunately after restarting Firefox only one page and its tabs have been reloaded.  All the others were gone. 

After trying about:support and session:restore it didn't help either, because only the 4th of Aug. was available. Is there a possibility for a session restore from the 03rd of Aug? or the previous days? If anybody has an idea, how to do so, please let me know.

Many thanks, Gerald R. Vargas

I made a change somewhere that caused a total loss of history/open tabs even in my tab manager extension. I can't remember exactly what it was I changed but nothing I have searched here has been helpful in recovering from this. I did not want to bring my profile from home as I am using Firefox here in a work environment. Can someone point me to or explain a step by step method to be able to do this? Nothing I found in searching here has been positive.

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.

I run normal firefox on linux. Fully up-to-date. Every time I quit the app, it reverts to a version of my profile from a month ago, and loads all the tabs I had open then, and then receives all the tabs that I sent to the device in the interim (~1 month). As I speak, it just caught the 60 or 70 tabs in this window.

I tried changing the name of my profile folder to randomstring.defaultOLD and changed one of the backups to randomstring.default. This didn't change the behavior. I'm still stuck in the loop. I saved my tabs with onetab, because firefox isn't remembering my session anymore. I thought it was something to do with updates, like it only loses its mind upon updates, but that's not true. It thinks it's updating firefox EVERY TIME, because the one time it's loading to 1 month ago it was updating, but I'm 100% sure there are no updates to firefox in my linux. It's just hallucinating.

The articles on restoring from backup are outdated. They say to use an html file. There is no html file. It's just folders for profiles, not html files. HELP!

After being nagged to update to the latest version of Firefox, i did so thinking all the windows and tabs would be restored. I have been thru multiple updates with with no problems in the past. I have been through most of the self help but nothing works. The restore last session is greyed out.

I do not speak geek.

Two days ago my Firefox icon in the dock looked very different there was an added something. I have not been able to restore my bookmarks or my sidebar and I'm now wondering if you're update did this. I want my bookmarks back in my bookmark side bar please tell me how to get it. Control B does not do it. I am legally blind and this is especially difficult for me. I don't want to have to sign in with passwords and numbers and letters something you did on your end wreck this website for me Carol Cummins

I had several windows opened and when I LOGGED OFF FIREFOX AND REOPENED IT ALL OF THE WINDOWS I had visited were gone, I tried to reopen FIREFOX and there was nothing I could do to reopen the windows.

Is all of my data gone?

Hi,

I had Firefox tab syncing set up on my phone, and the synced tabs were showing up fine on my other devices for a while. About 3 weeks ago, that phone was lost (long story — it ended up in a river) and I haven't been able to sync from it since.

Now the synced tabs from that device are no longer showing up on my other browsers, and I need to recover some important information that was in those tabs.

A few specific questions:

What is the current official expiration policy for synced tabs data (as of 2026)? I've found conflicting info in old forum threads — anywhere from 1 week to a year depending on platform and Firefox version. Is there any way to see whether my account still has cached tab data for a device that's been disconnected/inactive for ~3 weeks, even if it's not displaying in the normal Synced Tabs view? If the tab data has expired, is there any other server-side record (even temporarily) that Mozilla could check on the account side that isn't visible to me as the end user?

Any help checking the account status directly, or clarifying the actual current retention window, would be a huge help. For my email address, please request below.

Thanks, Ebe