I-Firefox Community Forum

I noticed when I went to check for updates the Fire Fox Browser is, Windows MSIX Package Mozilla, MSIX 1.0 143.0.1 (64 bit). What is this and why? Do I need to uninstall this version of Fire Fox and reinstall a new one? If so, how do I do that without loosing all my data. Thanks for your help!

Jon Spears

I have been having trouble with my Windows 11 laptop. In my efforts to resolve these issues I noticed that I now have two installs of Firefox in my Control Panel. Both installed during my time of dealing with my Windows issue. Five days apart Feb 5 and 10, 2026. Both show the same version number 147.0.3, and same size 322MB. I have used FF for many years so these seem to have been installed sometime during my efforts to repair Windows. My FF was never a part of the Windows issue AFAIK.

Anyway I have FF working as I like with my Session Manager and various AddOns and personal settings, so I do not want to have to start over with FF. So how do I choose which instance of FF to uninstall in Control Panel?

My issue with Windows was my Outlook would not connect to the server. I assume Microsoft Exchange server, my internet connectivity was fine. And FF was fne as well. I eventually was able to repair my M365 connectivity. Major PITA from out of nowhere.

The installation on my win 11 laptop is doing some odd things (1 - recently lost all extra (unselected) windows on restart, even though set to restore all windows and tabs and 2- opening a new window creates an outdated duplicate of the window I already have open instead of just creating a new window with an empty tab??). So I thought I'd try refreshing it. Well, my "More troubleshooting" page does not have the "Refresh Firefox" button, only the "clear startup cache" appears along with option to run in troubleshooting mode. No Refresh option in teh same page in troubleshooting mode either. I am using the Microsoft Store MSIX installation. I am thinking about uninstalling that one and installing from a Mozilla download instead??

What would be the best way to clean up my installation state since the refresh is not available?

Would like to test nightly builds of Firefox - how best to get started?

I am a user of Ubuntu and interested in testing the Firefox Nightly via snapstore.

Any pointers helpful.

I didn't request Modzilla/Firefox to be uninstalled but it was somehow. I run Dell SupportAssist first thing after startup of my laptop. I also run Norton Ultimate Utilities to clean up orphaned registries and broken shortcuts. After running both, then I start using my laptop but noticed Modzilla/Firefox was uninstalled along with all the associated bookmarks. I don't see any history on uninstalled activity after I reinstalled M/F. Really am puzzled by this uninstall. Anyone else experience this?

I installed the msix package from Microsoft Store. We can't add our autoconfig to the msix version? We don't have access to C:\Program Files\WindowsApps\Mozilla.Firefox_xxx.x.x.x_x64__n80bbvh6b1yt2\VFS\ProgramFiles\Firefox Package Root so we can't put the needed files there. So were are we supposed to put the autoconfig files? Firefox seems to have added support for the similar situation on linux with flatpak and snap. https://bugzilla.mozilla.org/show_bug.cgi?id=1785278 There isn't a way to use autoconfig on Windows if we choose to install Firefox from the store of the OS?

I'm running Windows 10 on my (oldish) laptop.

I have been running Firefox on this PC (and others) for over a decade.

I would like to install Firefox on my (Samsung) Android mobile phone.

Any ideas or suggestions are very welcome.

Colin Bell colin1954bell@gmail.com.