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Whenever I open a message from the inbox into its own window, the message text and images are tiny and unreadable until I zoom (Shift-Cmd-+) them larger. And when I reply to a message, the text is also starts out tiny, but gets larger when I Zoom it up with the original message. Similarly, the column-header icons of the inbox are tiny, while the text is OK.

All the rest of the interface is normal and readable, except for the tiny text and buttons in the interface-command/confirmation boxes.

I have experimented with the suggestions in these question-replies, but to no avail:

https://support.mozilla.org/en-US/questions/1474665

https://support.mozilla.org/en-US/questions/1480963

I can adjust the font size and density from the "hamburger menu", just fine. And the MacOS 15.3.n-on-Intel settings seem right.

What am I missing? What else is there to change?

Thanks in advance... Alexander, long-time T'bird user

I use this dark mode theme: Star Trek in Thunderbird but override Thunderbird so that Thunderbird is in light mode and the folder, message list and message panes have a white background with black text. The override uses the Autoconfig method (for Firefox but it was working also in Thunderbird Customize Firefox using AutoConfig . This is my thunderbird.cfg file in Thunderbird's install folder containing:

// IMPORTANT: Start your code on the 2nd line lockPref("browser.theme.content-theme", 2); lockPref("browser.theme.toolbar-theme", 2);

and my autoconfig.js file in Thunderbird's defaults/pref folder containing:

pref("general.config.filename", "thunderbird.cfg"); pref("general.config.obscure_value", 0);

In Thunderbird 145 this worked - all panes had a white background. However, when I updated to Thunderbird 146, the background in the folder, message list and message panes changed to grey with black or white text. With Thunderbird 146, both files are still present and the prefs in about:config are present with the 2 value. The Thunderbird 146 changelog mentions Visual and UX fixes and security fixes.

My Windows 10 colour settings are: default Windows mode = Dark default app mode = Light. These are my preferred settings.

I have changed temporarily to Thunderbird 140.6.0esr and got the white background re-enabled. How do I get the white background and black text back again in Thunderbird 146 please?

Thunderbird did an update 2 days ago. All of a sudden the buttons like 'forward as attachment' (and the others that were in that list) have disappeared. What happened to them? They used to be at the top left when you clicked on an email that you wanted to forward as attachment. Update shows this version--140.1.0esr

Thanks in advance for any help in getting those things back

My wife and I have separate emails and we also share an email account. My laptopn has Thunderbird profile set up to receive from both and data is held on our local NAS Wifes Laptop does the same and her data is on her folder on local NAS. For the shared email, we can each access and it creates a local copy on BOTH of our respective folders on the NAS. Whilst this works, i cant help wondering if we're setting up a sync loop. THe shared email isnt used much, but is there a way that we can share the exact same files /data for the shared email on the local NAS. ie. Still have one view in Thunderbird client but have the shared email data be on a common shared folder. Still keeping our separate profiles. This worked for Outlook pst files. But New Outlook is a disaster hence moving to THunderbird. . This seems to be a simple scenario. 3 email accounts 1 shared. 3 local data sets. One shared. 2 separate laptopns and THunderbird installations. One common local NAS. ANyone have any guidance for best practice ? THanks

I want to change all the tab bars to hide thread column but i cant do it because toolkit.legacyUserProfileCustomizations.stylesheets doesnt look for css file any more. That's a pita, i have a lot of folders I there another way of changing this and other things globally?

Hi,

In the Thunderbird email client, the subject line color of unread emails automatically changes from blue to black, even if I haven't opened them. This makes it difficult to distinguish unread emails, as both the sender's name and the subject line appear in bold black.

Is there a way to prevent this from happening?

Thanks, Yatin.

Something happened that took away my 'get messages' button and my 'write' button and the others that used to be there.

I can find nowhere to add these back. When I try to adde them back in view-toolbar-toolbar settings, 'SAVE' is greyed out.

Either I am a real dumb user or this is a real dumb bug that cropped up today.

I have no way to get messages or write one now.

MACOS Tahoe 26, 140.3.0esr (aarch64)

I like to use "Table view". I can select it after I open thunderbird, but every time I start thunderbird, it starts in "Card view". I am using release 140.1.1esr on Windows 11. My email is lmpetrie@live.com.

HI.

I'm trying to increase the size of the text-entry pane that appears in the calendar event editing pop-up. I already know how to change the size of the overall window (i.e., the pop-up itself), but I can't determine the name of the css element that would modify it.

I enabled developer tools, but the Inspector function doesn't seem to want to provide the name of that css element. It would be along the lines of calendar-event-pane, but that's not it.

Is that text window even specified in css, or is it hard-coded?

Any pointers would be appreciated

Hi Thunderbird community,

I have an issue with unified folders where one specific IMAP account keeps disappearing from the "Sent" and "Drafts" folder (this does not happen in any other unified folders that I have added the account to). The strange thing is that when I right click any of the unified folders it keeps disappearing from, go to their properties and click "Choose" both "Sent" and "Drafts" folders are already in there and when I click "Update" the account disappears from the unified folders panel and is properly integrated like it should be. It's quite annoying because I need to do this every time I restart the program.

In the attached screenshot you can see that the "Sent" folder is selected to be a part of the unified "Send" folder, but it instead shows up separate until I click the "Update" button in the unified folder's properties. Same applies to "Drafts".

Sadly I couldn't find anything on the internet so far, so I'm wondering is someone else has an issue like this an possibly knows a solution.

Best regards

Others have mentioned this but I'm not sure if there is a fix/anything is being done. The threads are all from previous Thunderbird versions.

I use Thunderbird for work. I have to find specific emails and folders - get to them quick. I am no longer able to do this. It's really distressing.

This is something really basic, that should be the default or else really easy to change.

I'm on a Windows machine and using Thunderbird 140.3.0esr. I've been using Thunderbird since 2003 and never had any problems. Now I'm panicking!

I have Thunderbird 141.0 on Windows 11. It started showing new emails in source HTML. It is set to view message body in original HTML. -- no change from before. So I rebooted laptop. No luck. I replaced the Thunderbird folder with a recent backup. No luck. I uninstalled and reinstalled Thunderbird. No luck. John

For as far back as I can remember I've been using Mozilla Thunderbird on a old computer running Windows 7. I've a Win10 machine here so a few months ago, I downloaded the latest Thunderbird and I was suprised to see it looked very different. After a bit of experimenting I managed to get it looking familiar so I uninstalled it with the intention of trying it again early in 2026 when I've a bit more free time, So this morning I installed the latest version but it looks even more different now :-(

I'm not sure how to attach images here but if it works, the original one looked like Capture01 and this morning's one is like Capture02. I still had my installer from a few months ago so I installed that one and it looks the same as today's one. Notice that there's no menu bar any more and AFAICT I can only view email headers and not their contents. Also, the 3 boxes at the top RHS (for sizing the window / minimizing it etc) don't work at all.

Is it me doing something wrong - or are there maybe some settings somewhere that I need to experiment with?

Good morning, We are a company with around 10 employees and we use Thunderbird as our email client across multiple workstations. Some of our IMAP-configured mailboxes are used on several PCs and have grown quite large, causing local storage space issues.

I recently discovered that Thunderbird offers settings to manage synchronization more efficiently — for example, by limiting the download of messages to the last X days (e.g., 30 days), or by excluding certain folders from automatic synchronization. I’m referring specifically to the options under: Account Settings > Synchronization & Storage > Advanced…, and also the Disk Space section.

I tried changing these settings on an already configured account, but the changes don’t seem to take effect — messages are still being fully synchronized. I would like to know:

   If I’m doing something wrong in the process;

   If these changes only apply when configuring a new account;

   What is the recommended way to manage large IMAP mailboxes in a business environment to reduce local storage impact and improve performance.

Unfortunately, our email provider doesn’t offer alternative solutions unless we completely change the IMAP configuration, which we would prefer to avoid.

Thank you in advance for your support — I look forward to your response.

Best regards,

I have 1 computer that shows bars at the top and left side that I like. The one at the top shows Get messages, Delete, Reply, Reply All, and a few more items. The one on the left side shows icons that are for Mail, Address Book, Calendar, Tasks, and Chat. I have another computer that doesn't have those bars. I have attached a screen shot from that computer. Both are running T'bird 140.4.0esr (64-bit) and both are Win 11 machines. I've tried everything I can see to get the 2 bars to appear on the 2nd computer. I hope someone can tell me how to get them to show up. Thanks, Mike

Recently installed a new version, after our old PC died. BUT now, when I do 'save as' of an email the system automatically saves it as a PDF??? Unless I select save it as a Thunderbird, a tedious business and extra key strokes. How can I get the system to save an email as an email?

Thanks, Brent Haines

So many emails require me to scroll to the right to finish reading one line, back to the left for the next, etc. They hurt my head, they take fireever to read, and they hurt my right arm too. Thunderbird used to have an option to wrap messages, but it looks like it was deleted.

I tried adding the following tom my user css:

1. messagepane {

   margin-left: 45pt !important;
   max-width: 900px !important;
   margin-right: 45pt !important;

}

The margin-left works. It gives a spacer between the message pane and the folder list.

The max-width and margin-right don't work. The messages still require horizontal scrolling, and the scrollbar shifts left, right up against the text, so it doesn't give the needed spacer.

I use the spacers to avoid the parallax-induced migraines.

I am an older user and have used Thunderbird for a long time . When switched to Yahoo I still preferred the Thunderbird layout and continued to use it . My computer became like me , to old to be useful , so I purchased a new one . When I set it up and downloaded Thunderbird it came with the Yahoo format that I find hard to use . Enough BS and to my question , how can I return to the old format ? I have a Dell computer running Windows 11 .

          Thanks for any help !  Ken

This is both a settings issue, and a privacy and security issue. I want to disable the google lens context menu item to protect my security and privacy from constant AI monitoring. I've almost accidentally clicked the new option before and I don't want to send photos or images to google's AI unless I specifically intend to do so.

I feel like Mozilla is interfering with people's privacy more and more, taking away features from their users, adding features we don't want, butting in and telling us how our browsers should work. This is starting to become absurd. Now you've added AI into the browser that can control how your tabs are displayed and named even, a setting I found while trying to disable Google Lens.

There's a couple other settings I need to figure out how to disable too, such as the context menu of translate and the ChatGPT context menu items. I just removed ChatGPT and a new AI chat bot option appeared. Just wow. What the hell Mozilla. Is your intention to just turn your browser into one big spyware?

Give me the option to disable all of this stuff you keep adding. I have a policy thats supposed to disable your auto updates too but YOU disabled that as well allowing you to install all this malware/spyware into my machine without my authorization.