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Currently, the latest version is 140.20esr. Since the middle of last week, there has been a phenomenon where unsolved and unprocessed appointments set in the calendar settings are no longer displayed in the next day's alerts.

Hi

I'd appreciate some help.

I have already set up two Mailcow email accounts in the same profile in Thunderbird. I want to set up a third but I've lost the "add an existing email" page. How do I find it again? I've checked the file menu or the three dash menu on the top right of the page and the option is missing.

How can I find it again?

Hello. I have a strange problem. I have the latest Beta version with an IMAP account running fine. I need to add a second POP account. When I go through the motions of New Account > Email, the 'Account Hub' box appears were I can enter the name of the account and the email address. When I click Continue, I get two green ticks and it says Looking Up Configuration then it changes to a spinning blue circle. This stays like this indefinitely. I click the escape key to close the window.

Then if I go back to the New Account > Email procedure, it takes me back to the same box with the spinning blue circle and I can't start the process again. I have to restart Thunderbird to try again, but it still won't work. I have tried starting in Troubleshooting mode and disabling add ons but like the blue circle I am going in circles.

I have two computers and on the other one I have the original Release version. This adds the second POP account with no problem.

I am on Windows 11. Can anyone suggest something to try?

I am aware that Windows 10 will continue seeing support for the foreseeable future, but what about older versions and builds of 10?

I ask because I'm currently on a machine that physically can't update beyond version 1909 build 18363.1198 due to an issue that occurred on my machine in November 2020. So I've been stuck at that version and build of 10 for basically the last five years. While I'm trying to see if I can update it to 22h2, the last known version of Windows 10 with the hopes of enrolling in the extended security updates, that may not be feasible due to how old the mahcine itself is. Will Firefox continue to support all versions of 10 for the foreseeable future and not just those on the ESU? If so, great. If not, what version will be the last that can support the version I'm on? I don't have a Windows 11 machine yet on a full time basis (I'm testing an 11 machine out, but I may not end up keeping it) and I prefer 10 to begin with, so I would like to know when I need to stop updating Firefox itself, so that I can be sure I'll be able to keep using the browser with my current OS.

I have several email accounts and they all work as expected, however I have two with similar but different domain names that automatically link for some reason.

Both are associated with my website and I am using the email service from my host. One goes to foo.com, the other to foo.net

I have recently moved my website to another host and had to setup my emails again. This should be a simple task of changing the servers in Thunderbird, right?

So I did that, but the SMTP server and email address keeps switching to the other account.

I set up foo.com with my email address and password, then I go to foo.net and it has the .com info already there. If I change that to the .net info and go check the .com account, it has been changed to the .net info.

I tried reverting the .net account back to the old server, but it copied that info right back to the .com account!

There is a dropdown box on the main Account Settings page where you can choose any account for your SMTP, but it only displays one of these, whichever one is currently filled out.

How do I un-link these accounts? They were not previously linked in any way - they each sent emails from their own .com and .net accounts.

Kinda been a comedy of errors. Wanted to set up a mailing list in TB. Started in CardBook. Too uncooperative. Was advised to use "regular" TB. PAB did not have the entries I needed, so was advised to copy entries from Google Contracts address book. Didn't know I had to hold down CTRL key and I ended up MOVING them, which emptied all my Google Contact from the Google Contacts address book. Tried to sync to get them back. Didn't. That address book is linked to https://www.googleapis.com/carddav/v1/principals/dalemwebb****@gmail.com/lists/default/. Can't seem to get them back. What am I doing wrong/what do I need to do.

I recently upgraded from 128esr to 142, and one of the versions changed the tab mute button into a separate button.

How do I change it back to mute button on logo? if it isn't possible, can I remove the mute button

My thunderbird account stopped receiving emails yesterday and is giving the message:

"Thunderbird The certificate for pop3.exemail.com.au is not valid for that server. Someone could be trying to impersonate the server and you should not continue."

Mails are still going to the Webmail account and my husband has an exemail account with the same settings that is working correctly.

Exetel is in the process of selling its email service to a third party but this isn't final until September 8, will moving to the new provider fix this issue or is there something else I should be doing?

There is no option to save, print, or export bookmarks to the device being used. I don't want to sync with another device; I want to keep a file on my device of my bookmarks. I lost all of them last time I removed and reinstalled Firefox on iOS.

Mudei de computador e ao entrar com a chave de recuperação de conta, é informado de que ela está inválida. Ao tentar alterar minha senha sem a chave é informado erro, que não é possível realizar a operação. Quando tento alterar minha chave de recuperação , só tem opção de fazer a alteração entrando na minha conta, sendo que estou tentando alterar por não ter a chave de recuperação. Como posso sincromizar novamente ou gerar uma nova chave?

I clicked on a link in a forum site - pentaxforums.com - that should have pulled up image from a private web site but I think the url has been hijacked, the image didn't appear and instead the browser started pinging alerts. I have run avast anti virus and malwarebytes, these found suspicous malware (trojan, key clone) and rebooted, but these alerts still keep appearing, however I am wondering of the browser alert system itself has been compromised. See screenshots. if I click on one it seems to be trying to go to a suspicious url. any advice appreciated Marcus Brown

I had Firefox on my computer. Something went wrong with a Microsoft update on 8/15/25 (which I was not aware of) when I tried to restore my computer I found the update and it said I could not restore my Windows 10 version as it had been 10 days since the update. When I tried to re install Firefox I now get an error message that files are missing and I can't reinstall. Help me. I love Firefox and want to use it.

The following is the message I get is: System Restore failed to replace the file (C: \ProgramFiles\WindowsApps.temp\15191PeakPlayer.50533F9B98293_3.3.13.0_x64_y5c4dfz5b2 with its originalcopy from the restore point. An unspecified error occurred duringSystem Restore.(0x80070003)

Hi, I use Thunderbird for Android Beta 12.0b6 and I have the following problems: 1. Most of the emails I deleted from the notification shade still show in my inbox when opening the app.

2. Since the last update, the gestures work poorly, I have to swipe 2 or 3 times in order to delete an email.

Please have a look into it when you have the time. Thanks

Att made me change my account password. Now Thunderbird cannot access messages. I have entered the new password in out going and incoming but there seems to be more to this than that because nothing happens. Where do I have to put in new passwords? Thanks so much. Marjorie