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I get an error message when updating "failed to check for updates". I think I've been stuck on version 128.11 64-bit for several weeks now. This is on a PC with Windows 11 Pro.

I looked at the system requirements page at https://www.mozilla.org/en-US/firefox/141.0/system-requirements/ . For Windows devices, the operating systems supported are listed as "Windows 10 or later".

In October 2025, Microsoft officially stops providing feature and security updates for Windows 10. However, they offer consumers and businesses the option of enrolling in 1-year, 2-year, and 3-year subscriptions for Windows 10 devices which will provide another 1-year, 2-years, and 3-years of additional security updates. You can read more about this at https://learn.microsoft.com/en-us/windows/whats-new/extended-security-updates

For those individuals and businesses who will be enrolling devices into the Windows 10 ESU program, will Mozilla continue to support Firefox on Windows 10 after October 2025, at least for those receiving security updates through Microsoft subscriptions? Or at that point will Mozilla consider Windows 11 to be the only supported Windows operating system?

Thank you!

Hi everyone

I used Refresh Firefox option and it created "Old Firefox Data" folder on my desktop.

Awesome stuff. Sadly I cant get rid of it, here is why:

1. At first it said that the folder is used by another program and I cant delete it because of that. Cool, I decided to uninstall Firefox and make a clean install, so I have space to delete the folder too.

2. Long story short, it didnt work. I removed Firefox and tried to delete that folder, but wait for it, yeah I cant because I need permission from MYSELF. Awesome stuff.

3. I decided to use safe mode, so I used run command to run msconfig and I changed it to boot in to safe mode. But wait for it! YES! Its bugged and I cant login in safe mode, because pin is useless and it doesnt give me option to use password, so after hour of various things I got back to my normal mode via CMD commands. THANK YOU MICROSOFT.

4. So now Im stuck with the lovely "Old Firefox Data" folder, which cant be removed normally, neither in safe mode and wait for it! NEITHER WITH ADMIN CMD, not even the takeown /f "Old Firefox Data" /r command. THANK YOU MOZILLA!

So is there someone knowledgeable enough to help me to get rid of that folder pretty please? Like really a lot please.

I made a mistake. I had 128 and went up to 140. It pretty much looks the same, but a big difference is an extension I always use says it will not work with 140. I don't care how good 140 might be; if I can't use my app, QUICKTEXT, then I don't need this. How do I go back to 128 or to a version that works with my extension?

I was following instructions for the problem of some task bar icons showing as grey boxes. Still have that problem plus added the problem that thunderbird launches with the setup accounts dialogue page. The 'help>troubleshooting information>profile file location' reveals the correct profiles that have been updated to the hour before I caused the problem. I have saved the '...roaming/thunderbird folder to an external SSD, and made a new new thunderbird installation following the instructions for moving files to a new computer. Problem persists. Thunderbird will not 'see' the profiles therefore I cannot see my emails.

Trying to set up existing email address. When I type in info, it says "Configuration found ..." When I hit done, I get "unable to log in at server. Probably wrong configuration, username, or password."

I have a Mac and have been using Apple Mail. I'm not sure what to do next. I was able to open my Apple account, but that password does not appear to work.

Any suggestions as to what I'm doing wrong and how to fix it?

Thanks

<redacted>@icloud.com

This is minor, however, some addons that I need currently only work up to version 138. The version found at Index of /pub/thunderbird/releases/138.0.2/win64/ is actually version 139.x. I was able to download 138.0.1 at Index of /pub/thunderbird/releases/138.0.1/win64/

I require a copy of Firefox focus for my 87 year old mothers recent purchase of a bergstom android smart phone. My Mum knows absolutely Zero about the internet!! While I am happy for her to be able to browse the web, I am worried about here online safety and an email address increases her chances of signing into a site and imputing sensitive data. Hopefully, over time, if she learns the basic and the risks involved she can further explore the wonders of the internet? I am happy to send a telephone no, to which a direct link for the download could be sent.

Thank you

Steven Taylor

Hello:

When I signed into my computer this morning, a pop-up asked me if I wanted Firefox to update. I let it do that, and then a pop-up came up letting choose among some photos and art for a desktop background. It even let me upload a photo of mine. I chose one of yours, now I can't change to any other photo I have on my computer. Please help.

Thank you,

Cynthia M.

I just updated Thunderbird and any email earlier than 2/22/25 is gone. My sent items folder is empty and my address book is empty. Any email containing a link. The link will not work.

I hope there is a way to recover my missing data.

I'm trying to install Mozilla VPN but it won't install. The error message is as follows: the installer encountered an error that caused the installation to fail.

I look after about 20 PCs. All Windows 10. All were running Firefox ESR ranging from 115 - 128. As I get time I update each to the latest 128.x. Using group policies I've disabled all update settings.

However, on two of the PCs, they have updated to v139.0.1. Both of the users swear they did not manually do any update. I can't figure out how they got downgraded to the retail channel.

So my question is, since 128 < 139 how can I get them back on to the ESR channel, without loosing history, bookmarks, passwords and saved logins? I gather FF's installer will detect 128 as an older version and throw an error?

ESR -> Retail to me is a downgrade. So is it possible then to upgrade back to 128.11.x?

Each PC is refreshed annually and the only backup of the profile folder I have is from the last refresh, which in most cases in 8-9 months old.

Is there any way to find out why the downgrade happened when group policy forbids it, and the user did not manually download and install the latest version?

When these downgrades happen they break things. For example, when one PC was downgraded to retail his outlook.com email no longer works. If he uses his laptop which is on 128.11.0 it works fine.

I need to speak with someone. Firefox was updated on May 23. I have been away and can not use new version. I can not get access to aol account. I want my old Firefox back