Firefox Community Forum

I have enabled the option to open the previous windows and tabs. I had one window that I always closed last as it had a lot of groups that are important for my work, so it used to open every time I started Firefox. Sometimes, even if I closed the window by mistake without closing other windows, I was able to get it back by pressing ctrl+shift+n.

But yesterday, I might have closed it by mistake and when I pressed ctrl+shift+n , it didn't come back. I wasn't able to access my window and now it's all gone. I don't see anything in recently closed windows in history.

I need those tabs back as they are very important for my work. they were a lot of tabs. I had many groups but now all are gone. I tried by using the previous.jsonlz4 in the sessionstore-backup by renaming it in the default-release profile as sesstionstore.jsonlz4 but still wasn't able to access my window.

I didn't clear my history as the tabs opened in the window still show up in the history.

Kindly help as soon as possible

Mozillers,

I depend heavily in my environmental and other work on Firefox and am grateful for its ability to restore previous tabs when my laptop, not infrequently, stops working abruptly.

Now the much-used bookmarks have disappeared. A search site states promisingly:

"To restore Firefox bookmarks, use the built-in backup feature by going to Menu > Bookmarks > Manage Bookmarks > Import & Backup > Restore, then select a dated backup or a manual file (like a JSON backup) to bring back lost bookmarks..."

But my Firefox's Bookmarks drop-down menu has no Manage Bookmarks option. PLEASE, what must I do?

Elsewhere I managed to find this file which apparently contains recent bookmarks:

"C:\Users\User\AppData\Roaming\Mozilla\Firefox\Profiles\unk14jlv.default-release-1647366062305\bookmarkbackups\bookmarks-2025-12-26_95_4IdGtYxezJpwuH1UIiT1bRwe1K6bcGO8rv0mqa9rUWU=.jsonlz4"

But attempting to open it with Applications\firefox.exe (default) accomplishes nothing.

FOOL-proof instructions would be wonderful. Thank you.

Today I was prompted to restart Firefox. When I did, I got a homepage that said "Congratulations on 150 versions of Firefox" or something like that. Then I shut my computer down. When I booted it back up, ALL of my profiles, bookmarks and web history are gone. I can't find anything on my desktop to "restore" my old settings. I'm prompted to "create new" profiles. WTF is going on?!?!

Dear Support,

today i recognize that my bookmarks are gone and i cant find any backup data or something else. First of all i restart morzilla. Then i restart my windows 11. still gone so i load a windows backup from yesterday. nothing change so i reinstall Morzilla but its still gone.

Is there anything else i can do ?

Just updated from version 140.0.4 to version 141.0 and all my bookmarks AND browsing history are gone! I do see the appropriate files in my Firefox profile folder.

I tried following the instructions in the "Fix "The bookmarks and history system will not be functional" error message" article (https://support.mozilla.org/en-US/kb/fix-bookmarks-and-history-will-not-be-functional?as=u&utm_source=inproduct&redirectslug=The+bookmarks+and+history+system+will+not+be+functional&redirectlocale=en-US), but they are not correct, i.e., Solution 3: Update Security Software definitions does not apply as I have Defender turned off in favor of using ZoneAlarm. And those instructions say to update the definition, but there's not place to update the definitions.

I tried to import bookmarks from the Bookmarks folder, but when I click on "Choose file", Firefox either does nothing or shuts down without displaying any error.

100% disappointed with this update!

All my Firefox bookmarks are GONE. I followed the directions for restoration, and the Restore (etc) window has nothing in it. I saved the bookmarks to a JSON (HTML) file on an external hard drive, but I cannot find a way to restore them. I'm just about tired of Firefox and the consistent problems. Please restore my faith. Thank you.

Hello,

I just closed FF (latest version) and opened it again and all my tabs are gone. I had a private FF window open, so I am guessing this is the cause.

Is there a way to get get them back?

/

Thanks

Yesterday I got a prompt saying there was an update available for download. Today when restarting my laptop and opening Firefox ALL of my bookmarks are missing!!! My bookmark toolbar is also empty. Where did all of this important stuff go? Please help me restore this my information asap. I am freaking out!

I was working away on copying some files, nothing to do with Firefox. Firefox was open, though I hadn't used it in several minutes. Upon returning to Firefox, I noticed that although my browser had been open, it was not open anymore. All that was open was the download window.

At times in the past, I've accidentally closed the browser window while the download window was still open. I thought maybe this was what had happened this time, even though I absolutely didn't do that. I closed the download window and clicked on the icon on my desktop to restart it.

And that was when I discovered...no more tabs. Not a single one. Just a plain single blank tab.

In searching for an answer, I found this page: https://support.mozilla.org/en-US/questions/1396868 but in my confusion and horror and anxiety over needing to get the tabs restored, I had missed this part: "Assuming you found the .html file, it should indicate which .jsonlz4 file it was listing out. Is that the file you want to roll back to (the .jsonlz4 file, not the HTML file)?" and I had started to follow the procedure below it, and after renaming the two files as specified, I realized...I don't have a file to restore.

And so now I have nothing. I don't know how to restore my tabs at all. I literally have no access to anything, because all was tied up in those tabs. How do I restore them? I did find another procedure elsewhere that used "History" and "Restore previous session," but the problem with that solution is that in the "History" there's no such option at all. (This is where I found that one.) https://www.bleepingworld.com/restore-previous-session-firefox/

I'm so afraid to try anything now, I haven't had this problem in years and now I'm totally lost and afraid to mess this up more.

As for the browser I'm writing about, it's the latest Firefox, as I have it set to automatically update. OS is w10.

Also, I only have sync set for passwords. I don't have it set for tabs, for the reason that I use different ones on different devices.

Please, please, help!

Thanks in advance.