Firefox Community Forum

Hi! i was wondering why my firefox reseted after reboot. i have all the important tabs and bookmarks for my university work, chores and articles, platforms that are mandetory on my uni. also, i was tinkering with partitions before the reboot because my steam didnt want to run any games. i was guided by the chat gpt with terminal coding to do get steam working even tho i didnt solve the problem. is there any way you can help me?

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.

Firefuxxed was refusing to open new tabs so I shut it down and restarted it (always fixes it) and all my pinned and open tabs were gone with no way to recover them, it took me half an hour to manually restore the pinned ones one by one but not all of them as I cannot remember all of them let alone all the open tabs I had (hours of research gone down the toilet).

There should be a way to backup and restore pinned and open tabs so this doesn't happen, the history option does nothing.

OS: Linux Mint 22 fresh install from a week ago Previous version of Firefuxxed updated after this shamossel.

I rebooted my laptop with both firefox windows I had open and possibly a private window too, then rebooted again without touching firefox, and now I can only restore one of the two windows. I checked my recently closed windows in history and there was nothing there at all. Is there anything I can do at all to restore that other window or is it just gone for good now?

I keep a lot of tabs open (~60) in any particular session - I find it's faster in this way to get back to a site.

About every six months or so, I lose *all* these tabs because of Firefox's inadequate session backup system. It only saves two or three total backups, some of which are completely out of date. But the worst scenario is when (1) some site pops up a new window; (2) I mistakenly close my main window before the new window; (3) I open this new saved window once or twice by accident, causing my 60-tab session backup to be overwritten.

Using a third-party session manager (I have tried all the well-known ones) can mitigate this problem, but doesn't really solve it because the re-opened sessions aren't quite in the same format as Firefox sessions and so lose information. In particular, I often lose each tab's icon as well as metadata for Tree Style Tab.

Could Mozilla please consider a more robust session backup system for Firefox? All it would take (I think) is to allow the user to choose the total number of backup sessions and the frequency at which a new session is added. Thank you!

I need to recover a `.jsonlz4` file to restore a Firefox session with 8 active instances, as the "Restore Session" feature only opened 5 due to the `browser.sessionstore.max_windows_undo` setting being capped at 5, and the full original `.jsonlz4` file is now missing.

In the`firefox/Crash Reports` directory, there are numerous files I can’t interpret, can I retrieve my session data via telemetry or other methods using this crash information. I’m using Linux Mint with Flatpak Firefox, and I also have crash logs containing a "last crash" text file and a string of numbers, could these be useful for getting back my session?

I've been backing up my opened tabs for the past 4 or 5 years with the steps in this legendary post: https://support.mozilla.org/en-US/questions/1257866

But this time it failed me and I don't know why. I just switched from Debian to Linux Mint, put everything up to date, but when I copy the sessions-store folder back into my session folder, as described in the post, nothing happens. I tried restoring only the 2 files listed there, and also dropping them in the general user folder, outside sessions-store, but still nothing. I've also noticed that the sessions-store folder isn't created automatically, even if I open a bunch of new tabs now and close the browser.

I don't even know how to begin troubleshooting this to be honest, this is the first time this method's ever failed me :(

I also saw this post: https://support.mozilla.org/en-US/kb/how-restore-browsing-session-backup But it doesn't help either.

Hello, after a power cut I lost all my bookmarks. When I try "Manage Bookmarks -> Import and Backup -> Restore -> Choose File..." nothing happens.

In the folder ".mozilla/firefox/6924v31j.default-1728390329118/bookmarkbackups" there are several backup files, but the newest has the date Jun 25, though the name suggests it's from Jul 2: -rw-r--r-- 23850 Jun 25 13:07 'bookmarks-2025-07-02_184_mg1znof1NbBiyJ14ZcO9SluvTvLZI-rxPSm20YZUJww=.jsonlz4'

In the directory ".mozilla/firefox/6924v31j.default-1728390329118" there is also places.sqlite from Jul 4 11:59 (that was the moment when the power was cut).

How can I restore my bookmarks?

FF 145.0.2 (64 bit) canonical-002 - 1.0 running on Kubuntu 25.10 has suddenly started locking up completely after a minute or so with an "unresponsive". As I have just put in the crash reporter: "I haven't had problems with FF before but just possible that this relates to my growing problems with Thunderbird see https://support.mozilla.org/en-US/questions/1551791. I putting a question in Mozill Support about trying to keep my tabs and perhaps groups before doing a complete reinstall." So my questions here are:

• I am planning to to a complete clean reinstallation from snap but is there a better (more stable) installation?
• either snap specific or generically: is there a way I can find the open tab list from the debris of this snap installation (and perhaps the groups but that's less important)?

TIA,

Chris

hello,

I want to transfer my profile from an old laptop to a new one. i am not comfortable with uploading my passwords to the cloud as i do not understand how this is safe. i made tar.gz file with the entire profile, almost 1gb and put that on the new laptop. edited the profiles.ini and install.ini and expected the profile will load, but firefox simply does not work in that profile. it cannot browse and clicking the menu button in top right does nothing. Please, help. If I share data below that is the working profile, not the one that fails.

This keeps happening and is getting worse every day.

Firefox is refusing to load tabs sometimes every few hours but recently every few minutes so I have to shut it down and restart it, sometimes when I do I lose all my pinned and non pinned tabs, I can't remember what they are so manually restoring them doesn't work.

There should be a way to backup all tabs so they can be restored when this happens.

FIX IT FFS.

OS: Linux Mint Latest update of Firefox

Running Linux Mint 22 on Dell desktop. On bootup, no bookmarks and message with link to restore them. Restarting computer sometimes works after multiple tries but often does not, currently on FF 138.0.3 but this problem has come up on several previous versions of Mint as well as FF. Now more frequent. No security or other software apps have been added or changed.

The last time I got the bookmarks to show I used the FF Save Bookmarks function to save them to a stick. That file shows on the stick as a .json file. Mozilla's choice, not mine. Manage Bookmarks in the hamburger menu generates a pop-up "Library" that will not access the .json file.

I lost all my bookmarks after updating. I couldn't restore them, and now I have to log in to all my accounts. Absolutely everything is gone. I've tried restoring bookmarks, but it doesn't work.

Randomly my firefix just get loggedout and when i immediately logged it in again using mozilla i cant see my bookmarks my other accounts my profiles and all my groups and other information it was like i had made a fresh account all my data is lost what to do ? PLZ help i really want my data back i have been trying to get my data. Working on it for last hour.

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.

yesterday i had all my stuff like every other day, and for some reason i randomly got logged out of alot of my accounts. Now i woke up this morning and the entire browser was reset. no bookmark shortcuts, no tab collections, all account locked out for no reason, what's going on?

I don't have any backup for this, and i didn't think i'd need it, because i'd never delete all ym data for no reason.

Is there even a way to get it back?