Firefox Community Forum

As the subject says Firefox wont auto update, I have to download the Firefox Installer to update.

Setting says :- Firefox is being updated by another instance

But what interface? How can I fix this? I did have Firefox portable but got rid of that and installed the full package.

Any help welcome

thank you,

Bob

Hello,

Today I updated to Firefox 143.0.3. When done (most of?) my add-ons were gone, in particular all my add blockers, facebook container, etc. Also, my search engine defaulted to Google (yikes!)from Duck Duck etc. I am very specific about trying to block all ads, trackers, etc and avoiding all Google products. Other things stayed the same like cookies preferences.

Is this done by design? Is there a file somewhere that still has all my add-on info, that I can restore.

I really would give up on browsing if I am forced to see ads all the time.

Thank you! Petrus Martens

HERE'S HOW I SOLVED THIS "SECURE CONNECTION FAILED" ISSUE:

Kept getting this error when attempting to update Firefox; didn't matter which browser I used; went through the forum postings and tried every this-and-that-and-this-and-that posted there; didn't work; finally --

i opened a $10.00 30-day hotspot account with Xfinity, and the download worked perfectly.

PROBLEM SOLVED.

After easy semi-automatic updates for many years, the last two updates (143.0.3 and 143.0.4 on Windows 10 64bit) have stuck showing "Downloading update -- 0 bytes" for hours. The first time I eventually gave up and used the installer from the Firefox site to re-install. This seemed to get me to 143.0.3 without losing any important data in my profile but was certainly the hard way!

Now the same thing is happening during the update to 143.0.4. What's going on? Are other users having this problem? -- jclarkw

P.S. -- How can you manually stop and update during the download process? -- jclarkw

Presently 142.0.1 (64-bit) installed; previous updates/downloads had no problems.

Now, however, going to https://www.firefox.com/en-US/?utm_campaign=SET_DEFAULT_BROWSER and attempt a download results in this (image).

Any solution to this?

Thank you.

I have taken the position of never installing updates of firefox in windows 10 because of the following: after EVERY update, within 20 minutes of activity my mouse freezes. Keyboard is inactive. I have no option but to reboot. Windows displays "repair mode" 2 HOURS LATER ! the pc finally boots. This happens after EVERY upgrade. Since I have stopped upgrading, the pc behaves.

I had renewed my subscription for MS365 on Tuesday the 30th when I got a popup inviting me to update Firefox to the latest release. I agreed and the download appeared to have worked. However, I soon found I could not access any of the MS365 apps. I restarted and found Firefox had also disappeared. The icons are present in the list of apps but clicking on them gets no response.

I have deleted and reinstalled Firefox and downloaded a new MS365 with no change.

I have Norton online antivirus and the MS365 comes with continuous Defender using Malwarebytes. (I am running down the remaining Norton subscription). I have also used both to do a sweep on each but no problems were found.

I have Outlook which has not been affected.

I am coming to the conclusion that I may need to do a full deletion of both. Can anyone suggest any other way to deal with this?

(Win11Pro) If I allow Firefox to update itself from 123.14.0 ESR to 140.3.0 ESR (now apparently 140.3.1 ESR), the update apparently corrupts something in the browser so that it does not respond to the entry of ANY URL. I have to restore a backup of my C: drive, losing some recent data every time. As it stands, I cannot update Firefox beyond ESR 128.14.0, which is what I'm using now. What should I do? Do I have to switch to another browser? Thank you for your help with this. --AnneF

For past few weeks, Whenever I try to update FFX on windows 11, it fails. It takes me to another screen and tells me to download Firefox. When I try to download it , it aborts with this message.

"download.mozilla.org has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site."

To download Firefox with new version I have to use another browser but no choice. Then with new version of Firefox, I have faced the same issue of update and used same approach to update firefox to a newer version.

This error appears for some google sites as well but the same occurring for firefox download site itself is not understood.

Ajay

apply patch failed message. version 143.0.1 September 19 2025 update. Yet states "updated" Details saying message apply patch failed is found via firefox browser settings-firefox update history-details. I noticed that on that exact day of the update Audible books will not play as they did previously on the same day prior to update. They play on every other browser but firefox.

Firefox Win7 I had disabled updates, now i want background updates to work. I have disabled all the hacks I did, but no joy. Reinstalled maintenanceservice, still none.

I was installing the latest vwersion and the all of my pages disappeared , plus the is not even an app to get in. Please help ... everything was on Firefox, even my bank account and email.

After your most recent update my bookmarks disappeared and I cannot make any new bookmarks. Your updates are always intrusive and disruptive given that you shut down my computer while I am working, but until now you have not damaged anything. If I cannot rely upon you I will need to look for another search engine that is more reliable.

Hi,

I have updated to version 139 and now the latest (142) manually. When I go to About > Firefox, I got error: Firefox is being updated by another instance

I am the only user logged in. There isn't any other instance. There are no other profiles.

Any ideas or is this a bug? Thanks.