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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.

Hi, Check out the attached screenshot. This is the image FF saves when a user does the following action on any page: Take screenshot > Save full page

I have almost 20 such screenshots where the Google AI answers are overlapping and certain areas of the screenshot are overlapping and cut off (in the attached screenshot, the Step-by-Step points number 2 and 3 for Fluffy Breakfast Pancakes is cut off). Really annoying. I would appreciate the concerned team taking a look and a fix for this.

To recreate: Ask Google AI anything (this is the Google AI that you get to from the google.com homepage by clicking the AI Mode button) and make sure the answer require some scrolling. Then right-click and Take Screenshot > Save full page. Overlapping/cut off screenshot is saved. Thanks

All of my emails are being marked as read immediately. I have that option turned off in settings on all devices. I am not using bit defender. This only started after I moved to a windows 11 computer. I only have one account. I have read the previous forum similar issues.

After the last update of Thunderbird, we lost the ability to send gmail messages from our pop gmail account. We only got incoming messages when we restarted thunderbird. We've worked for 6 hours with Claude Opus and it finally gave up. Out AOL account and our comcast accounts still work. We tried to create a new imap account in gmail and that spins forever. Account does not get created. the last error message was " Error Creating Account - Incoming server already exists."

Then we tried deleting the pop account and then creating a imap account and that also spun forever failing to create an account. Webmail works.

I am trying to switch from the ESR channel to the release channel. I have Thunderbird 143.13.0esr and am trying to upgrade to 153 (not ESR). When I upgraded, Thunderbird could no longer find the inbox for my primary email and I had to restore both Thunderbird 143.13.0esr and my email library from my Time Machine backup.

I am seeking advice on how to do some cleanup of an inbox anomaly so that I can install 153 without losing my inbox.

Details follow:

My primary email account has had an oddity in Thunderbird for years in which I have two inboxes: an active one with lots of email messages as well as subfolders, and an inactive one which is empty and no subfolders. I have tried deleting the inactive one by selecting it in the sidebar and choosing File, Delete folder, but that command is gray.

By poking around in my Library, Thunderbird, my profile, Mail, my pop account of interest, I discovered the inactive inbox is named Inbox and has only two files, "Inbox" and "Inbox.msf". The active inbox is named "Inbox prev" and has these files: "Inbox prev", "Inbox prev.msf", and a folder "Inbox prev.sbd" which has a bunch of files and more subfolders. All of my four email accounts have multiple folders and subfolders, but I was able to identify both my primary email account and my active inbox from various folder names that were unique to that account and inbox.

Today I followed the following procedure:

1. Quit Thunderbird (and all other apps) 2. Force a Time Machine backup 3. Download Thunderbird 153 for English, US 4. Verify the SHA hash 5. Install Thunderbird 6. Verify the signature 7. Launch Thunderbird

Both my active and inactive inboxes in my primary email account were gone from the Thunderbird interface. I checked my library and the files appear to still be there.

I proceeded with the following remediation:

8. Restore Thunderbird 143.13.0esr from Time Machine, replacing the 153 version 9. Restore the Thunderbird library folder from Time Machine

I launched Thunderbird and my inbox has been restored to the UI, but I am on the esr channel and not the desired release channel.

Is there any kind of manual cleanup I can do to get rid of the inactive inbox, rename the active inbox from Inbox prev to Inbox, and then re-upgrade to 153?

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.

hi :-)

My Thunderbird uses between 19 and 34 GB of RAM. It's cyclical (with a period of about 10 minutes).

What do you suggest?

Do I need to perform a performance diagnostic? https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance

Do I need to follow all the steps listed on https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems#Diagnosis_Steps, or can I skip some of them?

For the past few days, the text in the address bar can no longer be selected or edited using the mouse or keyboard. The “Customize Toolbar” option does not allow you to remove the address bar from the toolbar.

Unfortunately, compatibility mode doesn't help here either. The problem isn't caused by a plugin.

Is there any way to fix this without losing all my Firefox settings and add-ons? I'm hesitant to try repairing Firefox.

Windows 11 Pro 25H2 64-Bit/Firefox 154.0b5 (64-Bit)

On August 17 at 5 PM, I received an email on my primary inbox from breach-alerts@mozilla.com stating that my data was leaked from Paidwork, followed by an impressive list of exposed information. An hour and a half later, I logged into Monitor using the same email address, but only saw an old leak from Suno that I had resolved a long time ago. I couldn't find any new leak regarding Paidwork.

I'm running Firefox version 153.0 (build #2016172927) on a Samsung Galaxy S24 Ultra running Android 16. Firefox works fine accessing pretty much any website I ask it to, EXCEPT for one: https://www.site2241.net/. This is my own website put together with nothing more than HTML, CSS and some basic Javascript. It also has HTTPS for secure connections. Roughly 90% of the time when I attempt to access this website using Firefox on my phone, I receive a "The connection was reset" error. This is only happening with Firefox, and only Firefox on Android. I have Firefox on two laptops and a desktop, with the desktop running both Linux and Windows. None of them have this issue, only on Android. I've now also loaded and tried Chrome, Opera and Brave on to my phone. None of them give me this problem. Only Firefox. I've tried changing just about any setting in Firefox that I can think of (HTTPS-only Mode both on and off, DNS over HTTPS both on and off, Enhanced Tracking Protection both on and off, etc) that might affect this, and nothing seems to change it. Go to the website, and most likely I'll get the "The connection was reset" error. This website, puny and pathetic as it may be, is kind of my running technical diary. If anyone has any ideas, please let me know. I'd really like to stick with Firefox. Thanks!

Suddenly thunderbird will not accept emails from Yahoo. It use to. The email shows up with a line through it like it has been deleted and the message is blank. How do I fix it? Someone suggested looking at options to see if it's blocked but I cant find the option button

Hello,

I have an issue while detaching an attachement under a directory that has is name on a network share "G:\03_AFFAIRES Ad & FI\"

When i detache a file inside this directory the link in Thunderbird is broke because it become "G:\03_AFFAIRES Ad "

It was working in the previous version of thunderbird ESR 140.x

I'm running mac os 10.13.6 and have installed Firefox 118.38 ERS but some websites are not allowing me to proceed due to my system being outdated/unsupported, what can I do about it? Cheers in advance for any pointers.

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?

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?

I do not want Firefox to be my default browser, nor to I want it to start when the computer is started. I DO want it to use the same tabs & windows as the previous time I closed it.

But every time Firefox updates automatically, it resets those setting back to te default. How can I get it to keep those setting?

Whenever I sign in to my VA account, I check the box to "Remember this browser" (as attached), but it never works. VA IT told me it was an issue with the browser (i.e., Firefox). This might have just been their way of making me go away quietly. (Blowing me off!) But I thought I'd check with you anyway. Can you help? Thanks

i have checked my mouse settings and reset everything but no change,,this started after a windows update, so i went in and uninstalled the update but did not fix the problem..i don't know how better to explain it, the scroll just stopped working while trying to scroll web pages,when i try to scroll the page doesn't move ., if i move my pointer over to the right side where the indicator of where you have scrolled to is and i click under it to scroll down and sometimes it kindof goes crazy and scrolls through many,many pages instantly...i hope all this some sense to you computer gurus cause i have tried everything that i know...thanks for giving it a shot..i use firefox browser and windows 11