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Yesterday (10/1/26) Firefox went through SEVERAL updates to v.157.0. Now, it behaves extremely buggy and locks up if I try to open more than one window. It was never this pathetic! I want to revert back to the previous version. Yes, I am running Win10.

Also, now it will not even close properly. I have to go into program manager to kill all of the subprocesses that have spawned. I DON'T LIKE THIS VERSION AT ALL!!!!!

The plugging is NOT updating and it's blocking me from watching anything on streaming. I've tried triggering the update by turning it on and off, by tugging on and off the "DRM" option in settings, by turning off the updates and then looking for updates... I went to about:config and made sure that all options were "true". What I get is an "error in downloading the update" that I can't fix.

Can someone help?

From "About" on the Firefox menu I am trying to download the update from 145.0.2 but it is stalled at 27.1 of 31.3 MB. The little pair of spinning arrows icon just keeps spinning without making any further progress. I'm on a 2020 iMac running Sonoma 14.5 My internet connection is still functioning. I'm wondering what I should do. Is there a way to just cleanly stop and start over? Or stop and continue.

I've had a problem for a while where Firefox tells me "Firefox is being updated by another instance" and the only way I've been able to get updates is by using the installer.

In my attempts to resolve this, I learned of the `about:profiles`. I have never set up profiles so I figures I should only have the 1 default profile but it turns out I have `default`, `default-release`, default-release-1`, and `default-release-2`.

Of these profiles, the `default-release` is the 1 that has my data while it is `default-release-1` that is able to update.

I would like to make it so that I only have 1 profile that has all of my data AND is able to update.

I already tried removing all the profiles accept the one with my data but that leaves Firefox unable to update. I restored all the profiles I removed and I am back to where I started.

Does anyone have any suggestions?

I installed firefox on ubuntu 24.04 following the guidelines from https://support.mozilla.org/en-US/kb/install-firefox-linux

I followed the direction from the section "Install Firefox .deb package for Debian-based distributions", adding the https://packages.mozilla.org/apt repository, prioritizing that over firefox snap from ubunto repors and finally installing firefox.

All good, now I have the latest firefox.

Question: what entry should I add to the "Unattended-Upgrade::Allowed-Origins" section of "/etc/apt/apt.conf.d/50unattended-upgrades" in order to enable unattended upgrades for the mozilla repo?

Googling this got me different contradictory recommendations that did not get my system to firefox 146 until I manually run the apt update/upgrade.

Thanks!

I am running Firefox 149.0 (64-bit) on Windows 10. FF tells me that there is an update. I downloaded the update, and when I restart FF, it does not update. Version 149.0 is re-started, and Help --> About Firefox again tells me to restart to upgrade. I have tried the upgrade at least three times.

I wanted to try the new split screen feature. The guide says you need the latest version 149. When I check 'About Firefox' it says I have version 140.9 but it also says 'Firefox up-to-date'. Could you advise how I can update to latest version 149 please?

The details:

1.) After downloading the update, my antivirus scanner reports an infected file (see screenshots / message + path).

2.) When I try to “Restart Firefox to complete the update,” Firefox briefly “disappears” (whatever happens there) and then “reappears”—but the prompt “Restart Firefox to complete the update” is still there. Unfortunately, this can be repeated as many times as you like without anything changing.

3.) Restarting the computer (Platform: macOS Tahoe 26.5.1) does not resolve the issue either (see screenshot). I always performed previous updates before shutting down the computer—and the next day (since Firefox, as expected, had been closed and restarted), the updated version of Firefox was running.

4.) The suggested solution is to download the “Firefox installer.” But that doesn’t help me, since I need “Firefox DEVELOPER.”

Would uninstalling Firefox DEVELOPER and reinstalling it >WITHOUT DATA LOSS< be a solution??

I can't access the Firefox password manager on my desktop Windows 10 PC. See screen shot #1 from attempt. Further investigation shows a failed update which seems to correspond to the date the access problem started per screenshot #2. Passwords are available on my IOS Phone as normal.

What should I do to restore PW access?

Thanks, Craig Lamison

Desktop version update to 157.0.1 acted like a fresh install. Prompted me to import from previous browser. Firefox was my previous browser. I have my bookmarks backed up, but lost all my tab groups, which is a huge problem to try and recreate. Lost downloaded themes. Lost downloaded extensions. Why did this happen? I can't imagine it was by design.

Hello, I am still running an old WIn 7 media center because I have applications I need that are no longer supported elsewhere. Firefox ESR has been working just fine up until the most recent update - which repeatedly fails to install each time I start Firefox. Is there a location where this update resides? If so may I know this location and procedure to eliminate this errant update? Thanks!

Why hasn't firefox 147.0.4 updated to firefox 148 ? The computer is windows 10 home 64 bit that is enrolled in extended security updates. The update has been released a few days ago I believe, in Canada,also I;m wondering if there is a button that is available in "about:config" that forces a update check. Thanks James

Need an update for the update. My Mozilla settings say my operating system (Ubuntu 22.04) handles the updates, and it's a deadend. I can only use my browser for one minute before it freezes and a force quit is necessary.

Hi! Long time user of Firefox, Love it. Never had any problems until the last time I opened it and was prompted to allow Firefox to apply the new update. Well. The applying update wheel has been turning around and around for the last two days and has left Firefox completely unusable. Please help.

After updating to Firefox 152.0.1 this morning I keep getting Error 7023 Service Control Manager each time I start Firefox. The error description states "The MozillaMaintenance service terminated with the following error: Incorrect function." The Mozilla Maintenance Service was set to Manual and I set it to Automatic but still getting error each time I start Firefox. I have read that the service can be disabled so what do you suggest I do to stop the 7023 error. Thank you.

Log Name: System Source: Service Control Manager Date: 6/18/2026 1:39:26 PM Event ID: 7023 Task Category: None Level: Error Keywords: Classic User: N/A Computer: DESKTOP- Description: The MozillaMaintenance service terminated with the following error: Incorrect function. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

 <System>
   <Provider Name="Service Control Manager" Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName="Service Control Manager" />
   <EventID Qualifiers="49152">7023</EventID>
   <Version>0</Version>
   <Level>2</Level>
   <Task>0</Task>
   <Opcode>0</Opcode>
   <Keywords>0x8080000000000000</Keywords>
   <TimeCreated SystemTime="2026-06-18T17:39:26.8970149Z" />
   <EventRecordID>409659</EventRecordID>
   <Correlation />
   <Execution ProcessID="464" ThreadID="648" />
   <Channel>System</Channel>
   <Computer>DESKTOP-           </Computer>
   <Security />
 </System>
 <EventData>
   <Data Name="param1">MozillaMaintenance</Data>
   <Data Name="param2">%%1</Data>
   <Binary>4D006F007A0069006C006C0061004D00610069006E00740065006E0061006E00630065000000</Binary>
 </EventData>

</Event>

Update fails, apparently in post-refresh hook with the symlinks in /var/snap/firefox/common/snap-hunspell/ pointing to non-existent files in a non-existent directory (e.g. to /snap/firefox/5701/usr/share/hunspell/en_US.aff where /snap/firefox/5701/ does not exist).

A thunderbird update (128.6.0esr->128.6.1esr) fails very similarly.

I used snap to update manually in order to see error messages:

donald@dhl-pd70sneg24:~$ snap refresh --list Name Version Rev Size Publisher Notes firefox 135.0-2 5701 270MB mozilla✓ - thunderbird 128.6.1esr-3 634 221MB canonical✓ - user@machine:~$ sudo snap refresh error: cannot perform the following tasks: - Run post-refresh hook of "firefox" snap if present (run hook "post-refresh":

rm: missing operand Try 'rm --help' for more information. ln: failed to create symbolic link '/var/snap/firefox/common/snap-hunspell/et_EE.dic' -> : No such file or directory ln: failed to create symbolic link '/var/snap/firefox/common/snap-hunspell/et_EE.aff' -> : No such file or directory

Starting and ending state of /snap/firefox/: user@machine:~$ ls -tl /snap/firefox total 0 lrwxrwxrwx 1 root root 4 Feb 6 08:24 current -> 5437 drwxr-xr-x 7 root root 201 Dec 10 10:01 5437 drwxr-xr-x 7 root root 201 Nov 25 19:59 5361