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I usually have three tabs pinned for easy access. Upon using the new "add tab to taskbar" feature though, there's a problem.

If I use the button to pop out youtube music for example and then close the version of the browser that it came from, and that my pinned tabs are on, any subsequent times I try to open firefox won't keep the tabs pinned. This also happens if I attach youtube music to my taskbar permanently and try to open it from there and then try to open firefox regularly.

It's probably a security setting...for some websites I go to Log In and nothing happens. Same for say signing up for a webinar. 80% of the time now Especially if I'm following a clicked eMail...so most likely a tracker of sorts?? ChatGPT not helping...wants me to do some techy stuff.

Trouble Shooting Mode, turning off ETP off for site AND in Exclusions... In Chrome, no problem.

Running Malwarebytes and Kaspersky

I'm hoping someone else has solved this!

Thanks

Starting yesterday, Thunderbird will not let me delete all the junk from my Junk folder. When I right click on it and select Delete, T-bird freezes with NotResponding and I have to restart it. Once I went through and used Delete on the individual files within the Junk Folder. When I restarted T-bird, it had moved all those files to my Inbox - several thousand of them.

Can I simply delete the Junk file at \AppData\Roaming\Thunderbird\Profiles\hxza0a1k.default-release\Mail\mail.aircraftdesign.com? Or would that kill the whole thing?

Any other workaround? I spent 4 hours talking to Network Solutions, they checked all my account settings and said it is all correct.

I Updated to Your Latest Thunderbird (Default) Update: And Now I Can't Open Addresses in A-Separate Window.... So I went Back to Previous Installation: And Now It Can't Find my Original Histrionic Emails on my D:Drive... I'm Trying to Reinstall my Original Version: And It's now Looking for mt Emails (which Don't Exist) On my C:Drive... It's Now Midnight Here and I'm Going To-Bed: I have Other Actives Saturday and Sunday Morning.... Can You Help Me Via my Email???? Lawrence W Emark X@verizon,net> Thank You!!!!

(PII redacted by moderator)

1. Enable the search box to the right side of URL box in browser UI.
2. Open new tab (empty URL box).
3. Press TAB.
4. The search engine SELECTOR becomes highlighted, instead of the search INPUT.
5. Web application software developer is blocked from typing search query right away.
6. Must press ANOTHER TAB.
7. This breaks the workflow. It never used to do this, you could type immediately after tabbing ONCE.
8. Search is disabled in URL box to facilitate local domain resolution/error and NOT trigger fallback searching.

Please revert the behaviour to normal, and make the single TAB operation focus on the search INPUT.

Can get(POP3), but can not send emails to a newly created personal outlook.com account.

the following error occurs when trying to send mail: Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)

all my setting are correct per thunderbird and microsoft:

  (smtp-mail.outlook.com, port 587,  STARTTLS, OAUTH2, xxxxx@outlook.com)

thunderbird error log file contains the following: . . . mailnews.smtp: S: 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [CH5P220CA0005.NAMP220.PROD.OUTLOOK.COM 2026-02-28T23:29:21.878Z 08DE7703D4D1982A]

SmtpClient.sys.mjs:452:17 mailnews.smtp: Command failed: 535 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [CH5P220CA0005.NAMP220.PROD.OUTLOOK.COM 2026-02-28T23:29:21.878Z 08DE7703D4D1982A]; currentAction=_actionAUTH_XOAUTH2 SmtpClient.sys.mjs:578:19 mailnews.smtp: Error during AUTH XOAUTH2, sending empty response . . .

Based on my understanding its seems thunderbird is using SMTP AUTH instead of OAUTH2 as required for newer personal outlook.com accounts. Is my assessment correct? If so, is there a fix?

Why is there not an option to say "no" to Firefox automatically loading when you restart your computer? There is only "yes" or "not now". I am not interested to my internet browser loading and opening once I have restarted my computer. I use my computer for much more than browsing on the internet. I am tired of always having to click the "not now" option to only have it show up the next day or two days later, where I then have to click, yet again, the "not now" option. I even went into Firefox settings and have not found an option to "op out" of this particular feature. Can you please add a "no" option to automatically opening upon restart.

i used to use CCLeaner browser, but I have changed my default browser to Chrome. However, when I click on a link in an email in Thunderbird, it still sends me to CCleaner browser. I can "copy link address" and paste it into Chrome, but it would be more convenient for me to be able to click on the link and go to Chrome directly. Where in Thunderbird can I change this?

Voilà le message d'erreur quand je veux envoyer un mail ou transferer un mail L’envoi du message a échoué. Une erreur est survenue lors de l’envoi de l’e-mail. Le serveur a répondu : DfERwzp30T90v Mail rejete. Identifiant et adresse mail appartiennent a 2 utilisateurs differents. OFR203_528 [528]. Veuillez vérifier le message et essayer à nouveau. C'est récurrent et l 'adresse n' appartient pas 2 utilisateurs différents Je suis obligée d 'envoyer de mon portable où je n'ai pas de soucis Cordialement

Hi. Since the Thunderbird update in March/2026, my Bell sympatico.ca email is no longer able to send emails out through Thunderbird. No error messages but emails never get to destination (I tried sending to myself on both gmail and sympatico accounts). I receive emails without issue. I tested the sympatico from the web or my iPhone and it works. Seems something changed in T-bird back in March?

I validated the Outgoing SMTP server settings and all seems OK (See attached file for screenshot of settings). Any idea why and what changed to cause this?

Tx, Robert Ziwani