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I have always downloaded and used the beta version of Firefox on both my Windows 11 and Android environments. Recently I've noticed I'm no longer using the beta version on Windows 11, but am so far unable to find a download for it, either from the Windows Store or Mozilla itself. Can anyone tell me if it's still possible for members of the public to install Firefox beta on Windows 11 platforms, if so how, and if not, why not?

Hello, I went to https://archive.mozilla.org/pub/thunderbird/releases/ or perhaps it was from https://releases.mozilla.org/pub/thunderbird/releases/ and downloaded the thunderbird-60.6.1.source.tar.xz package, unarchived it and am now stumped :) How to proceed from there?

1. Where can I find the release notes for Thunderbird versions?

2. I mistakenly installed v148.0 from the release channel, when I really want the ESR version. This article says, " "Still unsure which channel to use? Start with the Thunderbird Release channel. You can always switch later if your needs change." and this thread says that one can perform the necessary downgrade by simply deleting the compatiblity.ini file from the profile folder. However, the current release channel version (149) and the version I have installed (148.0.1) are far ahead of the ESR version (140.8.1). I have already configured 8 IMAP accounts and 4 add-ons and would like to retain my existing profile. Can I simply downgrade by deleting the compatiblity.ini file from the profile folder or do I risk data corruption due to changes to the data structures? Can I simply install ESR 140.8.1 over 148.0.1 or do I first need to uninstall 148.0.1?

Will thunderbird run on an iMac With a M4 chip? I’ve tried to move the app from an older iMac to my new one and all I get when I open it is a message that it’s corrupted,

Len S

I have downloaded Thunderbird from official Mozilla homepage. It seems to be installed correct. I got the icon and a question : should we start Thunderbird now. I answer yes. Then I get the message : Thunderbird is not found ? but I have just loaded it ? I am running windows 11 and I have got newest upgrade.

Hope you can help me out. Thx in advance. Regards Thorvald Antvorskov

PS I also have a PC running Linux Mint. Loading Thunderbird here was no problem.

New computer, trying to install Thunderbird. "Download" created a file called Unconfirmed 750544.crdownload which isn't executable and doesn't seem to do anything. How do I proceed to do an installation?

I'm trying to switch from Thunderbird ESR (140.8.0esr) to release (148.0). Following the Mozilla support recommendation I'm running the 148.0 setup and trying to install it to the same directory. While doing so I'm asked to restart the computer. After doing so I'm required to restart setup but continuously asked to reboot the computer. is there a zip version of the installation? if not How to overcome the restart issue?

I am trying to re-install Thunderbird on my wife's old Gateway desktop. I downloaded version 115.18.0 and tried to install it, but get a message saying it can't be installed because my OS is 32 bit. I thought the SuperNova would work for both 64 and 32 bit OS platforms. (It does work on my Toshiba laptop, which is a 64 bit Win 7 machine.) If this version of Thunderbird will not work, what about the last version that will. It was installed years ago. Thanks, Peter

Okay, I currently have two issues going on, both repercussions from transferring Thunderbird to my new computer. I'll limit this post to one issue!

My transfer to the new computer was not taking; followed instructions but no profiles were loading. I thought that perhaps this was due to my initial problematic installation of T-bird decades ago, where I eventually wound up with a choose-user-profile panel that worked fine with its default setting...so I lived with that easily (see image). Thinking that this was causing the inability to load profiles on the new machine, I tested whether I could delete the never-used profiles in that panel. After just one deletion, that resulted in the "Couldn't load XPCOM" error described here: https://support.mozilla.org/en-US/questions/1360766 Following the instructions on that page to do a repair installation (to the letter), starting T-bird now results in the attached "profile missing or inaccessible" message.

Please advise: Am I doomed?

Thanks for any honest advice. (yes, my Thunderbird installation is big: seven or eight addresses, many local folders, a large history and archives.)