Yonke imikhiqizo Community Forum

Continuation of my prior post: https://support.mozilla.org/en-US/questions/1516342

Thunderbird has a routine problem with being unable to log into various mail servers. I have four accounts and they all seem to share this problem.

Most recent update: I've tested this in Windows Safe Mode, and the problem has not appeared. Since I can't do any useful work in Safe Mode, it's hard to give it a thorough test, but so far so good. Also, I have removed AVG antivirus because it was redundant. I have seen no improvement since it was removed.

Can this problem be resolved?

Hi

When Thunderbird is started maximized it overlap taskbar if is set to hide and taskbar won't show until Thunderbird is minimized and maximized. Another way is to press the Win key two times. Then the hided taskbar can be shown/use. The same thing happens to Firefox. Only when is first started. Then if Firefox is minimized and maximized, press Win key two times, press F11 two times then the hided taskbar show/hide normal.

It is a setting that can be changed to start Thunderbird and Firefox in full screen and do not overlap hided taskbar?

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?

I can receive mail fine. Cannot send mail on gmx.co.uk acct, but gmx.net works on oauth2. But oauth2 is missing on gmx.co.uk It's just not on the pulldown. I tried a new thunderbird acct for gmx.co.uk but oauth2 is still missing.

Can not send emails to a newly created outlook.com (free) account. Have tried dozens of different settings, approaches.

My current setup:

 - windows 10
 - thunderbird 140.8.0esr (64-bit),  numerous previous versions also do not work
 - outlook.com (free) account mail provider
 - POP3 enabled (tried IMAP enabling also) on outlook.com account
 - no 2FA or 2FA enabled on outlook.com account, no difference
 - outlook.com web access works fine
 - followed instructions in mozilla support article Microsoft OAuth Authentication and Thunderbird in 2024 
      (https://support.mozilla.org/en-US/kb/microsoft-oauth-authentication-and-thunderbird-202)
 - have done a fresh install on a new machine without an existing profile.
 - have tried various microsoft servers, have tried oauth2, normal password
 - thunderbird account creation works just fine.
 - server settings and SMTP settings match as recommended by support article noted above
    SMTP server settings
        server name: smtp-mail.outlook.com  
        port: 587
        connection: STARTTLS
        authentication: OAUTH2
        user:  xxxxxxxx@outlook.com

symptoms:

 - receiving(downloading) emails works fine.
 - sending emails fails with following messages
     Login to server smtp-mail.outlook.com with username  xxxxxx@outlook.com    failed    followed by 
           Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 
             'Authentication method' in 'Account Settings | Outgoing server (SMTP)'

Many people seem to be having this issue with no resolution.

Please help.

My Policies.Json can only block 1000 websites. Nothing after the 1000th entry is blocked. Is there a way to remove this limit?

Firefox 150 on Windows

Thank you

I am setting up Thunderbird on a Win10 machine, and am having a lot of trouble adding accounts that I did not have on the two Win11 machines I have set the same accounts up on.

When adding my 2 GMail accounts, after clicking "Allow" on the OAuth popup the button would go grey the window would stay open and not close, and the account would not be added.

Changing the general.useragent.compatMode.firefox option to TRUE allowed me to progress and finally add those accounts.

I am now having the same trouble with my @hotmail.com account. When I add the account, the dark blue OAuth window pops up, but is completely empty, and there is nothing more I can do.

Things I have tried

• Reverting the above config change
• Checking that cookies and JavaScript are enabled
• Checking there is no saved password
• Used both the Account Hub and the default dialog, with the same effect.

Thanks in advance!

The email address box does not accept the email address and comes up with an error message. The only way to send an email is to use a different browser ie Google. Emails are still received as normal on Firefox / BT mail

I use an online retailer to buy birthday cards and gifts - Moonpig.com. Whenever I choose Paypal as my payment option, it logs me directly into my Paypal account without me entering any details. I have several Paypal accounts and want to choose which one to use. I have no saved payment details on Moonpig's site and having checked, they say that somehow my browser is logging me in automatically. That's Firefox and I want it to stop.

I have no issues with Firefox storing log-in details but I should be able to choose which Paypal account I want to use.

Any thoughts please? UF

I am trying to connect to usenet via my news.newshosting.com account. I can read the newsgroups ok but cannot send a reply for some reason. I get "user posting not allowed" followed by " Sending of the message failed. The message could not be posted because connecting to the news server failed. The server may be unavailable or is refusing connections. Please verify that your news server settings are correct and try again."

My 140 version of Thunderbird froze and I removed it and downloaded 140 afresh but it will not run. I just get a white screen and the settings button will not respond.

Since Firefox updated to version 148.0 it has broken my ability to download any extension and I get that Installation aborted message for any extension I try to download.

It also broke my ad blocker, ublock origin, when it updated to 148.0

Hi,

I’m experiencing an issue with my website Fixit Home ([[Interior design and fitout company|https://fixithome.ae]]) ). Certain pages and elements, including images, navigation, and layout, are not rendering correctly in Firefox, even though they work fine in other browsers like Chrome and Edge.

I’ve checked:

The website code is valid and loads without errors in other browsers

SSL certificate is active and pages are secure

JavaScript and CSS files are loading correctly

Could this be a Firefox-specific compatibility issue, or something related to caching, security settings, or mixed content? I’d appreciate guidance on how to debug and fix this problem so my site works consistently for Firefox users.

Thank you!

When I use picture-in-picture for any video, all of my firefox browser windows go unresponsive. I can move the cursor around, but it won't allow me to click on anything. The only way to stop it is to open a brand new window which makes it responsive again and then close out of the PIP video. Sometimes it lets me go back to using the browser as normal, and other times it causes all firefox windows to crash. I'm using Windows 10. This issue only began happening about 10-ish days ago.

The Crash Report IDs are: bp-42f92617-671a-4e30-9d32-e1def0260302 bp-64cb35b0-5ab7-4b9d-8a80-7d2470260302

i had multiple tabs set up in multiple groups and i used yo restore these every day when i rebooted every morning and all that is lost to me now. i can see that the groups are there but can no longer use them. how can i uninstall mozilla firefox

Hello, I was using a cleaner program called "Cleaner One Pro" and I mistakenly let it clean my main firefox profile, and then I backed up my system afterward, unknowingly overwriting my recent backup. When I tried running firefox again, it had regressed to an earlier snapshot of my profile and was reloading all my tabs as well. Also, all my previous sessions and my history was all erased. This program should not have erased those, and if it had not, I could have simply let the tabs reload and been fine. So my profile was left in an earlier state with no way to recover current tabs. I have many, many, many open tabs on firefox, which has NEVER been a problem whatsoever. All my tabs were in an earlier version. I, however, found that firefox had made a partial backup of my profile into another folder in the same folder as my profile, but this backup was not complete, and trying to use it as a complete profile resulted in only a few tabs open at all, worse than even before. But this limited backup included my complete, current history. Are there any other file or files in this limited profile backup that I could use to restore my open tabs? I am using the absolute latest and newest version of firefox. My sessions and similar files are missing from both folders. It seems this funny little partial profile backup was made, and I was hoping there was a way to restore my open tabs from this little, smaller, partial firefox backup profile folder. Has anyone ever seen this, and how can I recover?

As of now, I restored an 11-day old profile and was able to import my new history into that using an extension, and if worst came to worst, I could at least recover my history and all the sites in that time of the missing 11 days I had went into, but I was hoping to recover my current tabs from that time as well. In this limited profile backup folder that exists next to the profile folder that was trashed, Is there any other file besides the session files that could have stored my open tabs, that I somehow didn't see or know about, which I could use to get my tabs back? I would willingly let firefox reload my tabs if possible to restore them as they were before this happened.

Thank you very much,

Gino Costa

p.s. you can email me at [edited email from community support forum] if you have any answers

Doesn't matter if I click File -> Get All New Messages or press Shift + F5 nothing happens and I don't get emails. Have to check each email account one by one. Downgrading all the way to version 78 didn't help. What can be wrong?

Also I've tried installing a special add-on to get all new message: https://addons.thunderbird.net/en-US/thunderbird/addon/get-all-mail-button-for-tb78. But it's not working either. Just nothing happens when I press the button provided by the add-on.