I-Firefox Community Forum

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.

Is there away i can get my browser history and data back ,i logged out of windows couldnt remember my password ,logged in with a new password and all my data is gone .....

I was able to use it this morning from my macbook. But the afternoon I was on sites where my passwords usually fill but now everything is empty, everything had been deleted. I tried to log out and back in to mozilla and sync, but everything is gone. Over 100 sites and passwords. How this happened ? Where can i ask for help since Mozilla doesn't offer any.

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

Hey there! It seems that my bookmarks are gone. I only see the place holder for them, but no link or anything else. What can I do? Is there a way to import the bookmarks from the Mozilla website? Curiously the bookmarks on Firefox Android are there, but I can't see an option to export the list from there. Many thanks for any help! Best, Wolfram

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

Hi there, When I turned my laptop on this morning everything from my browsing history and pinned tabs to my bookmarks and passwords was just...poof...gone. I feel like someone stole my first born. Not sure if I'm just in a panic and not remembering how to fix this easily but regardless, please can someone help me:'(

It has always been the case that when I closed Firefox, it asked if I wanted my open files saved and reopened when I opened the browser again. I needed to restart my laptop and I decided to close Firefox first. It asked if tabs should be saved and I said yes. After I restarted the laptop and reopened Firefox, all of my open tabs (I think about 35) were gone. Can I get them back?

Greetings everyone,

Earlier, when I opened Firefox it didn't restore the tabs and windows I had been using from about 2 weeks ago. I tried looking in "History" in the Firefox menu but it only displays tabs and windows that I've closed and it doesn't have the tabs and windows I had actually open.

I've had the same Firefox settings since I first installed Firefox a few years ago and this is the first time this has happened... :'( :'( :'(

I must have had about 70 Firefox windows and even more tabs within those windows so this really hurt me... :'( :'( :'(

Thank you for any help!

Something or somebody emptied my bookmarks. I tried the import/restore routine but was told that Firefox "was unable to process the backup file." I also tried System Restore without success. Can you help me? I don't want to leave Firefox, but the problem reoccurs, which is maddening and time-wasting. Thanks, Bruce Berckman

I was, admittedly, perhaps doing a bit much on my ram at the time. but i didn't expect this. i didn't expect it at all.

screen went black a moment, firefox crashed. I figured it was fine! it crashes sometimes. it always restores my tab. the little bug report was there! willing and ready to restore my session for me. i let it restart fox.

i get the firefox sesion restore tab. but i already am filled with dread and upset. because i can see, in my peripherals, the blue button to restore session, is already greyed out. checking the little drop-down that shows you your session- [expletive]. empty.

God. what the [expletive]. I- what the [expletive]. it's a stupid thing to cry over, im sure. But some, most, of those tabs were YEARS old, from when i moved. and i've been having a hard time thinking about my old home lately. and now i've lost another bit of home. Some of those tabs may not even be in my [expletive] history anymore; i have a weird cut off of my oldest history in the history window, library window, thingy, where i can tell history was wiped, but i never wipe my history. i have no clue why this wipe even happened! Other then pushing it on my pc a bit much, but it's not been the first time i haven't paid attention; and it's restored before! what the [expletive]. Deeply upsetting. i've tried, even, to restore things myself; i have a 'upgrade.jsonlz4' file, few months old, but enough to have most of my tabs if it were stored inside; tried to rename it one of the recovery files, 'recovery.jsonlz4' and 'recovery.baklz4', then both, but doesn't work to get my windows back. This is awful.

Dear Mozilla Support,

My name is Sizhe Xiong. Today when I launched Firefox on my Windows computer, the browser suddenly required me to select or create a new profile before continuing. I had no option to skip this step, so I created a new one.

After that, Firefox asked me to log in or register a Mozilla account. I used the same Gmail address that I’ve always used for Firefox Sync, but it seems that a new account was automatically created, and all my previous data — including bookmarks, history, saved passwords, and extensions — disappeared.

When I checked my local Profiles folder under C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles, I found several new folders created around the same time, but none of them contain my old data (all places.sqlite files are around 5120 KB).

These bookmarks and passwords are very important to me. Could you please help check if it’s possible to recover my old Firefox data, or if my previous Sync data can still be linked to my Mozilla account (using the same Gmail address)?

Thank you very much for your help.

Best regards, Sizhe Xiong

After an update on F***fox meant I could not access my emails or radio programmes, etc, etc, I reverted F***fox and refused to update it daily. Now it has updated itself and I have lost all my bookmarks, hundreds of them. WTH have you criminals done?

Hi, it looks like Firefox pushed an update on September 19, and after that, all my tabs were closed, I got logged out of all my accounts, and it opened a new blank Firefox window. Is there any way to recover my tabs and data?