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About a month ago I began the process of upgrading from W10 to W11. In the process, several problems happened. One of the problems was with Firefox. After reading and trying many suggestions from the Mozilla site, as well as several other sites, and having no success, I posted my problem on this Mozilla support site and hope that there was someone who could help. There was. After several days of exchanging messages (suggestions, instructions and results - mostly about Profile), Firefox returned.

The other major problem is Thunderbird. I have downloaded a current version (128.5.2esr). I have run it twice and, each time, email was downloaded. So that part seems to be working. What doesn’t appear are the settings I have used and message folders I have created over several years. I suspect that the problems are Profile related.

Starting from Help in the Thunderbird menu, then Troubleshooting Information, then Application Basics, I see Profile Folder. On that line is a button labeled Open Folder followed by (Local Drive). I click Open Folder and File Explorer opens to a folder named ab3xaztm.default-esr. It shows that the folder contains 59 items, including 10 subfolders. All files and folders show a December date.

Following the path C:\Users\rsuth\AppData\Roaming\Thunderbird\Profiles\, in addition to ab3x…, there is another folder nlys3gkl.default that contains only 1 file, times.json.

Because of my earlier struggle – and eventual win – with the Firefox problem, I think that the Thunderbird problem might also be fixed in a similar way: Profile.

Slightly before the upgrading from W10 to W11, I made a copy of my Thunderbird folder. I think if I replace the currently active Thunderbird folder with the one I have saved, my Thunderbird problem may be over. However, I’m not certain that will happen and I’m not certain about the specific steps to take to make the replacement. (With my Firefox issue, there were a couple of small important steps I had to take to make it work, and those steps were explained to me by the person who helped me with my Firefox problem. So, after all these words, can someone point me in the direction to solve my Thunderbird problem?

Thanks for reading.

I'm trying to transfer the Profile folder from my current laptop to my new one. I followed the directions here: https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer but must've made a mistake because none of my many Local folders have populated Thunderbird in the new laptop. Also, the GB size, number of files and number of folders show to be very different on the new laptop vs. the current one.

I'm inclined to just start over but have a question. Can I simply delete the contents of the "Thunderbird" folder under "Roaming" in my new laptop and try again to paste into it? Or are there some items in that folder that were inserted when I first downloaded TB into my new laptop so that doing a complete deletion would remove those and they wouldn't be replaced when I try pasting again? If so, how do I get around that?

Thanks very much for your help.

I had a computer crash recently and my calendar won't save a new entry (and has no entries). How do I remove and reinstall (refresh) the calendar? Thanks for any help. My Thunderbird is 128.4.4esr (64-bit). My OS is Ubuntu 24.04.1

I have to use ctrl - many time to see everything on my screen. I promise, I didn't change anything, just updated. I'm not super literate about things like this and my IT husband has gone onto his next adventure. I'm hoping for a simple fix. Thanks.

Bonjour à tous J'ai essayé de toute sorte de manière de me servir de Thunderbird pour envoyer des photos avec le (menu contextuel, envoyer vers le destinataire) Il fonctionne avec Windows 10. Je peux faire fonctionner Microsoft Outlook, mais pas Thunderbird avec Windows 11 pourquoi? J'ai fait toutes les paramètres mise par défaut, ainsi que mail to.

Toutes mes choses sont dans Thunderbird et je l'aime plus que tout (connait plus). J'aimerais beaucoup si vous pourriez m'aider, je vous en remercie à l'avance.

Back in September, 2024, Microsoft Outlook no longer accepted my long-used login information via Thunderbird. I could still log in to https://outlook.live.com/owa/?realm=hotmail.com from the Firefox browser. I tried adjusting Account Settings (e.g. Server Name, Server Type [POP], Security/Authentication, etc. to no avail. I downloaded the current version of Thunderbird (128?) and tried installing per directions found here. Tried using the Flatpak path. The direct Command Line path yielded the same result.

dave@Sequimer:~$ sudo flatpak install flathub org.mozilla.Thunderbird [sudo] password for dave: Skipping: org.mozilla.Thunderbird/x86_64/stable is already installed

On edit: Did what I hoping to avoid and deleted Thunderbird and all of the Thunderbird related files in the Linux home directory. Then installed a current version of Thunderbird and imported email stuff from an earlier backup. It works but now I have two renditions of Thunderbird running simultaneously.

I use a Firefox browser and a few days ago I got a message on my screen saying I wouldn't be able to use it after January 2025. I didn't read the message properly so I can't give any details.

I have looked at system requirements to update my current version but as I will explain it is not possible for me to update: I am using an old iMac - OS X version 10.9.5 The firefox version is 78.15.0esr (64-bit)

To update I need to have at least Mac OS 10.12 or later.

I am not computer literate so I cannot update my Operating System so I won't be able to download a more recent version of Firefox browser.

• Will my current version still work after January (but with no new security updates)?
• or will I not be able to use my Firefox browser at all?

Hi Ive just installed macOS Sequoia and Firefox is really slow and showing a refreshing spining icon with a few tabs open, this never happened before the update. Is there anything I can do?

M2 Mac Mini 2023 running MacOS Sequoia 15.2. Firefox will not open after upgrading to MacOS 15.2. Searching online both Mozilla and Apple recommend uninstalling Firefox by dragging the app to the Trash and reinstalling. However, the Mac won't allow me to drag Firefox to the Trash. There are no Firefox processes running in Activity Monitor and the Firewall is turned off. Also, I'm unable to start Firefox in safe mode. I deleted the Library folder in Application Support for Firefox and still can't open the app or uninstall it. If I attempt to install a new copy of Firefox over the existing app I get the error message shown in the screenshot below. Can anyone suggest how to fix this?

Hello, I accidentally deleted a software-related folder under ProgramData in the C drive（which is shown in the picture）. Is this folder important? Will my deletion damage the software? Do I need to reinstall the software to avoid potential errors? Thank you~

Hallo zusammen,

ich kann meinen Firefox nicht mehr aufrufen, weil er wohl nicht kompatibel mit 133 ist. Es wird empfohlen zu deinstallieren und neu zu installieren. Aber dann sind meine Favoriten, Lesezeichen und Passwörter weg. Ich kann sie nicht sichern, weil ich keinen Zugriff auf die alte Version habe. Wie löse ich das Problem?

Viele Grüße Annette

Hello everyone,

I can no longer access my Firefox because it is probably not compatible with 133 (see screenshot). It is recommended to uninstall and reinstall. But then my favorites, bookmarks and passwords are gone. I can't save them because I don't have access to the old version. How do I solve the problem?

Best regards Annette

I am supposed to be on the esr release program, but today I was automatically updated to beta release 133.0. This is the second time this happened. Thunderbird shows a red screen, and recommends I install the last stable release, 128.5.0esr, which is what I want to do. But the last time, when I tried to go back to a stable release, it then wouldn't let me do that because it says the profile may no longer be compatible. I solved it painfully using timemachine backups of older profiles.

What is the simplest, safest way to downgrade, now that I am in this situation? And why is this happening?

Thanks for your help!