Firefox Community Forum

I had a lot of tabs open in Firefox, and they always stayed there even after restarting my PC. But suddenly, all of my tabs disappeared, and I can’t recover them using “Recently Closed Tabs.” Can I get them back?

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

Several times now I've closed firefox while having the open previous windows and tabs on startup on only for all my tabs to have been closed (with this time in particular being annoying due to losing tabs that I needed to have the specific link for). Is there any way to restore tabs lost in this way?

Desktop Computer. Still on Windows 10.

Not sure of category. This began when I launched the computer today. I opened Firefox and got the message "The bookmarks and history system will not be functional because ....."

When I started to shut down the computer (first mentioned step here) I saw there's a Window update. I selected Update and Restart. That went okay, but still don't have my Firefox bookmarks.

So I clicked on Learn more. I found the Firefox > Profiles folder. There are two folders, one from today - qkuxm6ws.default-release - 15...... 0196 with 94 items, and 7ghfiw 15.default, from Jan 5, 2021, with 3 items. I assume I should use the one with today's date.

BUT .... from this point, the information on this website was full of information - NOT step-by-step information telling me what to do with which files in this folder.

Also, I have McAfee as well as Windows Defender. I opened Windows Defender Firewall. State is On. Notification state: Notify me when Windows Defender Firewall blocks a new app. I've gotten no such messages.

Under allowed apps and features:

 "Firefox ... private not checked; public checked.."  
 "Firefox (C:\Program Files\Mozilla Firefox" - private is checked, public not checked.  

Can't make changes.

Under Overview window: Not checked is "Inbound connections that do not match a rule are blocked."

• • • • In the "Monitoring\Firewall folder" - Firefox (with path) is listed twice. Both entries have Private, Allow, NO Override -
      • Differences - the first has UDP; the second has TCP. Nothing under "Group."

My last bookmarks backup was Jan 2025. 😕 😟

I don't know where else to look or what to do. Please help. Kami

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.

Recently, Firefox updated and ask me to setup a profile, which I have not yet done since importing my data from google chrome in 2025. After skipping the setup, Firefox then deleted all my data and it has since been irecoverable. I have already checked the box last update that specifically said to not ask me again for setting up my profile. After the recent update, the question popped up again and now I cannot recover my original profile, all my browsing history, all my browser-saved data, and all my cookies and logins

After Firefox requested to be updated, I lost all of my bookmarks. I tried to go in and "restore" them but there are no backups to restore from. How do I get my bookmarks back?

When I opened Firefox, all my profile settings were back to a Default. Lost all my settings. Looked up solution on Google, couldn't find an "Old Firefox Data Folder" anywhere.

Tried the other listed "profiles" in my profiles folder, none were my most recent profile with all my settings from the past months.

How can I find the profile that was used before my update which was done 7/27/25 ish.

Thanks, Jean [email removed]

When I do this:

Click the menu button Fx89menuButton to open the menu panel. Click Bookmarks and then click the Manage bookmarks bar at the bottom. In the Library window, click the Import and Backup button and then select Restore.

I get a blank slate. No files listed.

When I go into the Profile, I see C:\Users\whatt\AppData\Roaming\Mozilla\Firefox\Profiles\shgdgxn6.default-release-1752271533405\bookmarkbackups

How do I restore bookmarks from that file?

Seit dem 25.12.2025 habe ich meine Lesezeichen und Passwörter, wahrscheinlich nach einem Update oder einer unbeabsichtigten Fehleingabe nicht mehr zur Verfügung. ich möchte meine Firefox-Version wieder auf den Stand vom 24.12.2025 zurücksetzen. Was kann ich tun oder kann man auch telefonisch Kontakt aufnehmen in deutscher Sprache?

I accidentally refreshed Firefox when I was having problems and didn't realize Refresh meant wiping everything clean. I found another thread about this, but it's 8 years old and things have changed. How do I use the "Old Firefox" folder on my desktop to restore all my bookmarks, history, etc.?

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.

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.

у меня стояла функция открытия вкладок из предыдущих сессий, но сегодня я открыл firefox сначало все вкладки были подписаны типа autoblock(или как-то так), я решил перезапустить браузер, в итоге открываю и ВСЕ вкладки исчезли, а у меня их там очень много и я точно не все вспомню, попробовал восстановить через журнал("восстановить резервную копию от" я выбрал от 21.10.2025, но она просто выдало сообщения, что текущие вкладки заменятся, на те, что в резервной копии и больше ничего не произошло) есть ли способ восстановить все вкладки не прибегая к тому, чтобы листать историю вручную?

Hallo Zusammen,

Meine Lesezeichen sind aufgrund irgendeiner angeblichen Virensoftware komplett verschwunden, auch die Leiste wird nicht mehr angezeigt. Speichern bzw. ein Lesezeichen hinzufügen kann ich auch nicht mehr und geändert habe ich nichts an irgendeiner Software. Der Strom ist ausgefallen, habe neu gestartet und weg waren sie. Neuinstallation und immer noch der gleiche Fehler. Virensoftware ausgeschaltet, trotzdem noch. Profil ist auch nicht geändert. Ich habe alles mögliche versucht, aber ich finde den Fehler nicht.

Liebe Grüße L.

After updating to version 137 today, all my bookmarks are gone. I've tried looking under "Profiles" to see if they're on another profile following the instructions from https://support.mozilla.org/en-US/kb/recover-user-data-missing-after-firefox-update; there are two profiles (default and default-release) and both have no bookmarks. I also tried following the instructions at https://support.mozilla.org/en-US/kb/recover-lost-or-missing-bookmarks to import a backup, but Firefox finds no backups to import from and there's no "Old Firefox Data" on my desktop to restore from. Search history and recently closed tabs history are intact, so it doesn't look like Firefox has completely destroyed the profile it was using before the update, just the bookmarks. Is there anything else I should try, or should I accept that this particular library of Alexandria has burned and just begin recreating the bookmarks?

I opened Firefox (V 145.0.2) on my Windows 11 laptop today and noticed that the starting window was the only one open, while I have had at least five windows open for quite some time. The "History|Recently closed windows" option is greyed out. I have closed and restarted Firefox dozens of times and my windows always came back until today. Is that window/tab history stored somewhere where I could recover it?

Thinking about backups of the browser state, I looked for my profile folder and discovered that it is empty - \Users\<username>\AppData\Roaming\mozilla is empty except for a file named vpn.moz. I then discovered that my profile seems instead to be stored under \Users\<username>\AppData\Local\Packages\Mozilla.Firefox_n80bbvh6b1yt2\LocalCache\Roaming\Mozilla\Firefox\Profiles with the folder name e5di8bjy.default-release I now learned that this location is standard for installation via the Microsoft store - the so-called MSIX version. But it is wrong that the "About"profiles" page shows that my profile is in the AppData\Roaming, not the Packages, location. When I try to open that profile folder, I get a message telling me that it is not available on this computer. It seems like the profile info should be aware of the actual location?