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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

Hello! I am having trouble restoring my old Firefox profile after migrating my system from Windows 10 to Linux (Fedora). I have a backup file in .html format that is 197 MB in size (originally created on Windows). When I try to select and restore it using Firefox's built-in recovery tool, it throws an error: "Something is wrong with this file. Please try again with a different file." What I have tried (and what didn't work): Moved the file from an external drive to the local Linux Downloads folder (the error persists). Tried dragging and dropping the file directly into Firefox (the recovery page loads, but the restore buttons are missing or inactive due to security/script restrictions). Tried renaming the file extension from .html to .zip to extract its contents manually, but the archiver threw a "Not a zip archive" error. The built-in recovery script fails to process a 197 MB HTML file, likely due to size limits or memory handling on local files. Could you please advise on how to properly handle and restore such a large backup file or extract my data (passwords, history, bookmarks) from it on Linux? Thank you in advance!

on my previous computer, I used firefox without an account. I uploaded a zip file from my desktop using Firefox. I'm wondering if there is any chance that zip file is still accessible and whether there is a chance it can be retrieved?

I opened Firefox this morning and there were no bookmarks or history. After looking online, I came to the conclusion that I needed to find the places.sqlite and bookmarkbackups files and folders. However, I can't seem to locate either.

I am running Firefox v153.0 (aarch64) on Mac OS v. 26.5.2

I have Time machine backups, but I need help locating the correct files to restore. Thank you.

Seit dem letzten Update auf 153.0.1 sind alle Lesezeichen aus der Lesezeichenleiste verschwunden. Die Wiederherstellung aus der .json- Datei in meinem FF-Profilordner, in dem sich die 12 Einträge befinden funktioniert nicht. Wie kann ich die Lesezeichen wieder herstellen? Ich habe keine Admin-Rechte.

Leider hatte ich FF auf automatisches Update eingestellt, das hab ich jetzt ausgeschaltet.

i am currently using firefox 153.0. can i restore firefox windows- and tab-structure as in sessionstore.jsonlz4 from a previous.jsonlz4 originating from a previous firefox version?

Sometime between 10PM 7/23 and 2 AM 7/24 I deleted my profile by mistake, and all of the data my browser collected has been lost. Passwords, history, cookies, chat logs, etc. No account sync, or official Mozilla profile until now.

Everything is gone and I don't know how to replicate the steps found in this video. Mac's don't conveniently show you things like deleted user data unless you know exactly where to find them. [|https://youtu.be/JWJwmKLqnZs?si=g_g47eHSwoB8XSL5]

I've already tried using Time Machine, but that failed spectacularly.

Current OS is macOS Tahoe 26.5.2, Firefox 153.0 (aarch64)

After the last few updates I have lost all of my bookmarks, I don't understand how this could happen. The bookmarks that currently populate my side bar are either inaccurate or empty. I'm flummoxed and frustrated and angry. Is it possible to recover past bookmarks - say a specific date?