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Environment:

Thunderbird: 153.0.2esr (64-bit) Operating system: Windows Occurs with multiple email accounts Reproduced on two different computers running the same Thunderbird version

Description:

After updating Thunderbird to version 153.0.2esr, released on 4 August 2026, emails can no longer be dragged and dropped from Thunderbird to the Windows Desktop or any folder in Windows Explorer.

The problem occurs with all tested email accounts and folders. It has been reproduced independently on two different Windows computers using the same Thunderbird version.

Saving an email manually with Ctrl+S works correctly and creates the .eml file. Normal drag-and-drop between folders in Windows Explorer also works. Only dragging an email from Thunderbird to Windows Explorer fails.

The issue also appears to affect third-party applications that use Thunderbird to create or send emails automatically.

Steps to reproduce:

Open Thunderbird 153.0.2esr on Windows. Select an email in any account or folder. Drag the email to the Desktop or another folder in Windows Explorer. Release the mouse button.

Actual result:

The email is not copied or saved to the selected Windows folder.

Expected result:

Thunderbird should export the email as an .eml file in the selected folder.

Additional information:

Ctrl+S successfully saves the same email. The issue affects every tested email account. Thunderbird extensions were disabled, but the problem remained. Thunderbird Troubleshoot Mode did not resolve the issue. Restarting Thunderbird, Windows Explorer and Windows did not resolve it. Thunderbird and Windows Explorer are not running with different elevation levels. The problem was reproduced on a second computer after installing the same Thunderbird version. No relevant error is shown in Thunderbird’s Error Console when the drag-and-drop operation fails. The issue was not present before the recent Thunderbird update.

This appears to be a regression in Thunderbird 153.0.2esr affecting email export through drag-and-drop and possibly Thunderbird’s integration with external applications.

Hello,

Tbird 153.0 (64-bit) on Windows using the Owl extension for microsoft authentication.

Everything was working fine till about 1 week ago. Apparently Cisco changed something and now I'm getting a TBird browser prompt that our Multi-factor authentication(MFA) DUO needs 'local access'. This is coming up in the 'captive browser' (I believe that is the terminology). This is the message:

Duo Desktop needs permission to access your local network.

Duo uses local network access to communicate with Duo Desktop. When prompted by your browser, please allow this permission.

I never really get a prompt to respond to this in Firefox or any other browser.

If I continue I'm dead in my tracks with this (also in the internal captive browser):

Allow local network access

Duo uses local network access to communicate with Duo Desktop

   Click the site information icon left of the web address in your browser.
   Click the toggle next to Local network access to allow access.
   The page should refresh automatically and allow you to continue.

This link is provided which isn't really helping:

https://help.duo.com/s/article/9470

Does this sound familiar? Can TBird use firefox instead of it's captive browser or allow the captive browser local access?

Thanks in advance!

Ed Mazurek Cisco Systems

At one time, I was able to access my email with Thunderbird. Then Thunderbird stopped working, and I didn't have time to research why. Monday, I bought a new Macbook. After installation, Thunderbird says "account settings found." Then it asks for a password. My password no longer works. Instead, I get a message: "Authentication failed. Unable to log in at server. Probably wrong configuration, username or password." What, if anything, can I do?

Good Day.

I have encountered a problem recently with on particular forum site.

When I attempt to login I receive an error after pressing the submit button. 

The form displays this error "The submitted form was invalid. Try submitting again."

I have been using the site regulary for several years and have never had this problem

The following is what I am using:

    Firefox ver 153.0.1 64 bit
    Windows 10 and/or Windows 10 (yes this is happening on all 3 of my PCs)

The forum site is using phpBB Forum Software. I do not know the version. As stated above they have been using this software for several years.

In trouble shooting this issue I have discovered that if I do the following in the specified order I can login and create and respond to posts and Private Messages. But as soon as I log out I receive the invalid form message until I do the following steps again.

            1) Clear all cookies, temporary cache, site settings, browsing and download history, site settings
               and saved form info.
            2) Shutdown Firefox 
            3) Navigate to my profile with Windows Explorer 
            4) Delete the file cookies.sqlite

I must do this each and every time I access the site.

I am at a loss as to what to do about this. Does Firefox have any error logs or console logs? If so how can I enable them to see if I can get a better idea of what is happening?

Thanks in advance for any help with this.

When i downloaded the app, it automatically came with the ability to group tabs, but after i customized several settings it took all of my tabs out of the groups and i can't group them anymore. The settings i changed ranged from privacy to personalization, i tried to reverse some of them to see if that would help and did a bunch of back and forth, but it's still not coming back. (Im trying to leave chrome because i noticed it had some very concerning lack of privacy settings that messed with my phone's ability to function properly if i turned them off. And Edge is worse.) Firefox seems better, but without the group tabs option it makes it waaaay too ridiculous to try and do any real work with it. I do a lot of multitasking and research and need to be able to bounce around and organize stuff. Your help stuff on tab groups doesnt say anything about how to turn it on or off. So... how do i get it back?

It's very odd. Normally moving an email, say from the Inbox to the relevant year's archive, takes "no time at all".

Which is true for all the mailboxes shown on the attached screenshot, EXCEPT for the four at the bottom. Moving even one message from Inbox to Yiddish can take ten seconds or longer (with the dreaded "Not Responding" occasionally). Moving something in the opposite direction is also screwy, only from those four.

I had thought that it was because they're rather large. This first started when there were just Yiddish and MSW, and I split off most of the earlier years into the archives shown. To no avail.

It's only an annoyance, but I'm puzzled about how such a thing could happen.

Also very slow tagging or untagging a message just in those mailboxes.

Please help, it looks like my passwords are not synced anymore on any Mozilla I use. I sue a Mozilla portable at home and a classic desktop on my office. The synchronyzation works for bookmarks, browse history and download history but not a single password is imported on my sessions ! My files are present : see screenshot01 so my passwords are here. Login.json contains data. So what's the problem. The debug mode said that : see screenshot 02 Thanks for the help

I'll be on a page, maybe Facebook, the NYTimes, Amazon, or really any site, and suddenly I find I can no longer scroll, or otherwise navigate the page. I usually have to refresh the page, not so great an option, if I was in the middle of doing something, and and then it'll work OK. I shouldn't have to be doing that, and wonder why pages will just freeze up like this.

I received a legitimate email from Mozilla Monitor stating my data had been found in a breach of Paidwork. I've signed into the dashboard but there is no trace of the breach there under action needed or fixed, and nothing on the notification bell. Not sure what to do next, I want to know whether my data was actually exposed and what to do about it. It makes me worry what else has been breached that I'm not being notified about, because if it can fail this way then why not the other way around too?

Thunderbird stopped downloading gmail this morning. It worked fine yesterday. I've restarted it 3 times to no avail. It says "Connected to imap.googlemailcom..." and it's been saying that for 2 1/2 hours now. Please help.

And please respond in non-tech terms. I am an old lady and I don't understand any of the stuff in the "help" section of your website. Still running Win10 because I can't handle the learning curve to 11. Please and thank you.

I was a satisfied user of the Thunderbird e-mail client. I especially enjoyed the ability to toggle into darkmode when browsing and reading my e-mail. The previous toggle I used to activate that feature is missing, and I cannot locate a work around to turn it back on. Any assistance would be greatly appreciated. Thanks

It was working just fine, and suddenly it stopped working. I hadn't rebooted my computer for over a month, and accidentally popped the circuit breaker the computer was connected to, so it rebooted for the first time in a long time. No other issues except Firefox will not connect to the internet when Proton VPN is running, but Firefox works just fine when the VPN is turned off.

I updated to the latest version of Firefox, so I assume that's the same thing as reinstalling it.

Proton VPN allows you to do what they call "split tunneling", where some browsers are excluded from the VPN (Firefox) and other browsers are always behind the VPN (everything else). I use Firefox as a secondary backup browser when the VPN is a problem and I don't want to turn it off.

I ran the Firefox "Safe Mode" and that failed to connect as well. I don't think it's the VPN? But maybe?

Any help appreciated, and thanks in advance.

gerald.r.vargas 4. Aug. 2026, 08:23 GMT-6 Hi, this morning for some reason all the tabs I had open couldn't been loaded. Refreshening the page didn't help either. So I decided to shut down and restart my laptop.

Unfortunately after restarting Firefox only one page and its tabs have been reloaded.  All the others were gone. 

After trying about:support and session:restore it didn't help either, because only the 4th of Aug. was available. Is there a possibility for a session restore from the 03rd of Aug? or the previous days? If anybody has an idea, how to do so, please let me know.

Many thanks, Gerald R. Vargas

Hello I am using Google Flow on my Linux PC and when going to edit scenes I get an error about a missing Codec. If I use Brave browser works fine so this makes me think this is not an OS issue but browser.