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Hello, i have three PCs with installed Tunderbird. On one of them i want to add a new mail-account. If i follow the instruction here: [https://support.mozilla.org/de/kb/automatisch-konto-konfigurieren#thun...], it leads to an input mask (not a Tab!!!), where i can enter an account-name and the mail-address. Clicking on Continue some automatic search is started but never stops (=> screenshot).

As i tried to do it several times now and tried to find other solutions, red instruction etc., i write now. Also: Im not sure if it is a bug.

I already mentioned in the beginnig: I have three PCs here. I used one of the others compare, wehere it works as described in the documentation (not an input-mask, but a Tab). So the probem occurs only on this PC, not on the other. Systems: Not working on win11 Thunderbird 144.0.1 (64-Bit) Working on win10 Thunderbird 144.0.0esr (64-Bit)

Regards, Frank

Mails that I want to keep in the inbox disappear. They are not in the bin and not in the junkbox. In Thunderbird for windows these mails are still in the inbox. How and/or where can I find an reactivate these mails? Kind regards Tony

Hey there! It seems that my bookmarks are gone. I only see the place holder for them, but no link or anything else. What can I do? Is there a way to import the bookmarks from the Mozilla website? Curiously the bookmarks on Firefox Android are there, but I can't see an option to export the list from there. Many thanks for any help! Best, Wolfram

I can't find where to edit the rules that I previously created for what will happen when a certain mail comes to my mailbox. I set up a rule that marks a mail from a certain sender with "Important" and also sends a copy to another mail adress but now I can't edit the rule. Can someone help me with where I can find the rules and edit them?

I cannot login to my aol email account on firefox desktop. All was fine before I turned pc off to go on holiday for 10 days. I can login on edge chrome etc

Have tried the usual things like clearing cache etc but not sucess

Please help I use fire fox for all my business so need to get access on it for aol emails

Many thanks

Hey, I am currently working on an application where I want to upload files to a server using mtls via a webapp. The upload goes to another url and server than the one where the webapp is served from. If I test the file uploading without mTLS, it succeeds, and with mTLS enabled it also works in chromium, but in Firefox I get the following error: "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at <url> (Reason: CORS request did not succeed). Status code: (null)." on the `OPTIONS` request before the `PUT` is done. The client and the server both have a certificate from a custom CA, which I imported into firefox, along with the private key. Does someone know what the issue here might be? I am suspecting that there is some problem with firefox loading the user certificate on the preflight request?

I have to add a office365 accounts. Everthing works, until Microsoft's popup window requires to sign in to MS 365.

When I click in "Sign In", nothing happens. The button becomes light blue for some seconds, then turns back to blue again.

The credentials are correct, there is no error message, nothing.

Probably a problem with the popup browser window?

Javascript is enabled. Anything else that could break this?

TB 143.0.1 (aarch64), MacOS 15.6.1

How can I transfer open tabs from my old computer to my new one? Syncing is enabled, and the sync tabs checkbox is checked, but the tabs aren't syncing on the new device. I also couldn't find any separate function to load tabs.

Hello,

I had issue to verify the cert on android app for https://partners-enrichment.heytelecom.be. On Windows I didn't have the same issue.

version 144.0.2 / build id 20251027123126 / target arm64-v8a armeabi-v7a x86_64 Device: Samsung S22 / One UI 7.0 / Android version 15 / version S901U1UES8FYI2 / Security patch level September 1, 2025

Error: Secure Connection Failed, because its certificate issuer is unknown, the certificate is self-signed, or the server is not sending the correct intermediate certificates.

CertChain RCA: DigiCert Global Root G2 DCA: DigiCert Global G2 TLS RSA SHA256 2020 CA1 cert: partners-enrichment.heytelecom.be

1) I couldn't check the cert from the gui as on windows. Shield in search bar / Connection not secure doesn't opened the cert. Is it expected?

2) I found this helppage: https://support.mozilla.org/en-US/kb/setting-certificate-authorities-firefox

Unfortunately about:preferences isn't available on android (ref. https://www.reddit.com/r/firefox/comments/u593x0/how_to_access_to_aboutpreferences_on_android/)

I see in about:certificate which is the correct RCA (I verified the pem file with the root). DigiCert Global Root G2

Where do I check the Intermediate CA's (DCA)?

3) When exporting the RCA it has been download as: digicert-global-root-g2.pem.txt Why the txt at the end?

On Windows it downloads as digicert-global-root-g2.pem

Kind regards,

Hi all,

I have found a bug with version 10.1 of the Thunderbird email app for Android.

When I go to Sent Items in the Thunderbird app, choose a previously sent email to view it, then choose 'Edit as new message', then make the necessary changes and choose 'Save draft', Thunderbird crashes and the new message is lost (not getting saved in drafts).

Matthew

I have have had a Gmail address for a few years and have just created a new Gmail address, I am trying to copy about 20,000 emails from the original Gmail IMAP folders to local Thunderbird folders as a backup, and then copy them to the new Gmail address IMAP folders.

I have tried copying these in smaller amounts as suggested (between 200 and 500 at once) This seems to go well, however, when I have completed the task the original folder has a much higher amount of messages in it than the new one, so some messages are being lost along the way.

Is there a reliable method to do this, such as closing Thunderbird and then copying and pasting data held in the profile folder, or does it need to be done with Thunderbird running?

Many Thanks in advance

Consider the following scenario: I want to go to "nextcloud.com", so I go to the address bar and start typing. Unfortunately, I make a mistake, and the first character I type is 'b'. Firefox then offers the autocomplete "bc.co.uk", and highlights it. I type another different letter, the added autocomplete offer is replaced with the character I added, and it will try to offer another autocomplete suggestion with all the characters I have typed so far. However, I realised the 'b' was wrong, so I press <backspace> then start typing "nextcloud.com". Of course, the backspace key now only removed the autocomplete suggestion, leaving the original 'b' I typed (so I now have "bnextcloud.com"). My question: Is there a way set configure firefox so that the key sequence 'b' followed by '<backspace>' to return the address bar to the original (empty in this example) condition? If this means turning off auto-suggest, I am happy to do that, since I don't use it anyway.

Thanks.

Hi everyone,

I’ve run into a weird issue with Thunderbird on macOS 26 (Tahoe) and I’m wondering if anyone else has seen this.

When I close the main Thunderbird window using Command + W or RedDot Close Button, the window disappears like normal, but something is still left behind. It’s like an invisible or “ghost” window stays on the screen. Because of that, I can’t click anything that was underneath the Thunderbird window. The area is still blocked as if the window never fully closed.

If I open Mission Control (F3), I can see an empty tile where the window should be, which confirms that something is still there even though it’s not visible.

A few details: • The problem happens every time I close the main window with Command + W • Thunderbird keeps running in the background, but I can’t bring the window back unless I quit the app completely • This only happens with Thunderbird, no other app on macOS 26 has this issue on my machines • On previous macOS versions I never had this problem

System info: • macOS 26 (Tahoe), fully updated • Latest stable Thunderbird release • Mac mini M4 and MacBook Air M4

It looks like some kind of window management bug on macOS 26, but only triggered by Thunderbird.

Has anyone else experienced this or knows if it’s a known issue? Thanks!