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I am running Thunderbird version 128.11.0esr (64 bits) on Windows 10 Pro. I have defined, in Windows, the default program for .doc and .docx files to be LibreOffice Writer and this works fine when I click on such a file in Windows.

But when I got a docx attachment in a Thunderbird email, and clicked on it, nothing happened. When I right-click on it, it just offers to open (not to select which program to open it with). I have to save the file locally, and click on it in Windows in order to open it.

This is very frustrating, all the more so that it used to work. I tried adding the two following lines to the prefs.js file, to no avail - no change:

user_pref("network.mime-handler.external.application/vnd.openxmlformats-officedocument.wordprocessingml.document", "D:\\Program Files\\LibreOffice\\program\\swriter.exe"); user_pref("network.mime-handler.external.application/vnd.openxmlformats-officedocument.wordprocessingml.document.useSystemDefault", false);

Any suggestions? Thanks!

Hello, In a recent upgrade to Thunderbird Mac OS x146.0.1 (aarch64), the FILTER selection options on some drop down menus are now blank. Example: "Priority" "Status"

These drop down menus now show no options (eg. read,)

I've two screen shots to illustrate.

Thanks for looking into this.

Glenn S

I have just installed Thunderbird v146.0, set up the first mail account (POP3) OK, then tried to set up a GMail IMAP account. I inadvertently gave it the wrong password, so the Account hub throws out the connection with an Authentication error "Unable to log in at server. Probably wrong configuration, username or password".

The problem is I can see no way of amending the password; if I try and set up the account again, it just skips the "enter password" step, presumably because TB thinks it already knows the password for this email account. I have tried the following:

- The "edit configuration" feature in the account hub doesn't have a change password option - The Saved Passwords section in Settings > Privacy & Security doesn't show the Gmail creds, presumably because it failed to set up this account in the first place - I reinstalled TB, having previously deleted the Profiles folder in C:\Users\<username>\AppData\Local\Thunderbird; everything I've read on this suggests this is the one and only place where TB keeps its data. However, when re-entering TB, the POP3 account I set up is still there, so there must be somewhere else that TB is storing its data, I guess the Registry?

Am I missing something? I can't be the only person who has had this problem!

Thanks

Hi Mozilla Community,

I am running Firefox on Windows 11 and I'm encountering a strange issue regarding the UI updates.

The Issue: My Firefox browser updates automatically to the latest version. However, my Default Profile is visually stuck on the old UI design. It does not reflect the recent interface changes associated with the update.

The Troubleshooting Context:

• I have verified that the browser itself is technically updated (via Help > About Firefox).
• The strange part: I have other Firefox profiles on this same machine. When I launch those profiles, they correctly display the new, updated UI.
• This issue is isolated strictly to my main/default profile.

Has anyone experienced this mismatch where the version number is correct, but the UI fails to refresh on a specific profile? Is there a specific fix for this?

Thanks in advance for the help.

I've got a new SSD and have reinstalled Firefox as my browser. In the past I've had the address field on the left and the search field to its right. I can get the search field on the same level as the address field but have not been able to switch their locations.

I have attached a screen shot of that section of my browser home page.

I thank you for whatever suggestions or guidance anyone can give.

Lee

More of a comment. Firefox is the only browser I have used. Love it! Many important bookmarks to easily navigate. Broser update messed up bookmarks and took me hours to get back! Found. Save key and/or password! Learned a lot about profiles and Firefox along the way. Ugh!

Hi,

I'd like to import my bookmarks on a newly installed Firefox system. To do this, I need to log in and enter a verification code. This code arrives by email, but only after a few hours. So it's too late to enter it.

Best regards

Friedrich

Hello,

sync and account email i want to login - i know the password but i never get the code for verify to login on my mail.

its not in spam, unwanted or anything else. i tried it many times now but i never get any mail so i cant login anymore.

how should i ever get access to my account again? because there is no other way..

Hi, after clicking FF icon, I got nothing. Profile manager (firefox.exe -P) does not start. In event viewer there is log: Name of the application causing the error: firefox.exe, version: 147.0.0.11, timestamp: 0x695c3722 Name of the module causing the error: unknown, version: 0.0.0.0, timestamp: 0x00000000 Exception code: 0xc0000005 Fault offset: 0x00007ffc561c6160 Faulting process ID: 0x4A54 Startup time of the application causing the error: 0x1DC85EE68CB3BAD Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: unknown Report Id: e599c553-d77c-4b73-a863-1ccaa8d3bd4c Faulting full package name: Faulting relative application ID for package:

Last time deleting profile was helpfull, today nothing helps... Reinstall - the same... Any ideas?

It seems that after updating to the latest version, Thunderbird is not displaying new emails. The numbers of new emails in the folders are changing, but the emails are not loading. I performed maintenance on the folder, but the emails disappeared and I no longer have any emails in my Inbox. I use IMAP, everything is OK on my phone and on the web. This is happening with Thunderbird at home and at work.

Translated with DeepL.com (free version)

I'm afraid I picked up malware despite Sophos due to this message upon routine searches, e.g. "Where's the nearest pet store". About this page Our systems have detected unusual traffic from your computer network. This page checks to see if it's really you sending the requests, and not a robot. Why did this happen? IP address: 206.194.252.88 Time: 2026-01-13T22:42:41Z URL: https://www.google.com/search?q=Pettstores+near+33069&ud m=14&sei=YMpmafbPMZyKwbkPzc23sAE

It's preceded by the reCaptcha request to check the box stating I'm not a robot.

I'm afraid to enter any passwords on here, to order anything, and especially engage in banking. I'm in a rental using WiFi, Thank You, Eileen

Hello, I've been happily using Thunderbird for a few years now. Since yesterday, I have been unable to send emails in Thunderbird, but I can receive them. I can send emails directly through my Skymesh Webmail, but in Thunderbird when I try to send an email, I get the following notification, even if I am sending it to only one recipient. Sending of the message failed. The message was not sent due to exceeding the allowed number of recipients. The server responded: Insufficient system storage. Please help. Regards, Judy Osborne 15th January 2026 [edited from public] @bordernet.com.au

Dear Agent, My computer has been updated to Windows 11 from Windows 10. The Firefox profile settings has not changed from Windows 10 to Windows 11. How can I edit or update to Windows 11 in my Firefox profile?

Regards,

My friend recommended this browser to me. When I tried to customize it, I couldn't find an option to change the hotkeys to my preference. I consider this feature important since I use it for work. Can I do this somehow, and is there any plan to add such a feature to the settings?