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When I receive an email with double line spacing I can't find a way to alter this to single line spacing. I'd like to be able to change from one to the other at will. M

Hello everyone

I recently upgraded from TB 69 to the latest TB (after a crucial add-on finally got updated), and I'm generally happy with it, except for one little irk:

In Classic layout, the preview pane now contain multiple messages. As far as I can tell, it contains all messages of the selected thread, in date order (not in message list order). I would prefer the preview pane to contain just ONE message, namely the currently selected message. It is annoying to have to click repeatedly inside the preview pane to access the individual messages in the preview pane. It is also visually confusing (to me).

What's worse, the messages in the preview pane do not follow the normal threading: they appear to be shown in order of date, not in the order of the messages in the message list.

In the screenshot, you can see the thread has 11 messages, and in the message list there are three subthreads. The preview pane also shows the 11 messages, but not in the same order as in the message list. Plus, in order for me to read any messages, I need to click inside the preview pane to fold each message in or out.

I prefer a situation where I can click a single message in the message list, and a single message is shown in the preview pane. Is this possible with the latest TB?

Thanks.

Hello; Windows 10 & current version of Thunderbird. I am trying to add Messages Filters to filter out spam (getting more and more of that!) but the "OK" button on the add message filter is below the bottom of the screen. The window cannot be raised or resized to make the button visible. Photo below. Moving window does not allow me to raise window above top of screen. Keyboard (Alt-Enter) / Move will not work. Changed windows screen size just makes window larger but button still below bottom of screen.

Non-functional work around. Highlight Message name. Press Shift-Tab TWICE. Press ENTER. UGLY!

Tech since DOS 3.0

Thank you for your time and attention.

I installed Thunderbird 138.0.1 (64-bit) on a Win 11 desktop computer yesterday and the column headers for the messages are not displayed. I have View/Headers/All, View/Layout/ Classic View, Folder Pane, Message List Header selected. How can I get access to the message column headers to display them and later select the ones I want ?

Thanks, Corey

Thunderbird 128.14.0esr on Debian 13 KDE. Email is in Classic View.

The mail headers take up far too much space.

Here's an example of the problem: http://map.atownsend.org.uk/tmp/Screenshot_20250829_150825_2.png . As you can see, about 50% of the UI is taken up by headers. I like the general layout (tree at the left, not included in screenshot, list of messages above and the message itself below) and I like the contents of the headers (I don't want to display fewer; I'd just like them to take up less space).

Changing the font via edit / settings / font / size has no effect on the headers (it may be changing the size of the text within the message, but I can't really see enough of that to be sure).

How do I change the font within the headers to a different, smaller, value?

I was viewing a new email in the usual way. At the top, there was the yellow bar with the option: Show remote content in this message

I accidentally chose not to display the remote content. I would now like to display it. However, I could not find a way to do this.

How do I display remote content after choosing not display it? Or, how do I get the "Show remote content in this message" option to return to an email?

I've installed TB on my new laptop and now, when I try to print an email, my list of printer options don't show up in the drop-down menu, only options to print to a PDF file. It says it's printing, but it's not. How do I restore my list of printers?

I'm transferring to a new computer. The old computer is using version 140.4.0esr (yet it says it's up to date, when the other computer is using 144.0). I have 2 e-mail accounts setup, so the left panel is a little longer. In the old version that left panel that shows all the folders is 100% the height of the window. On the new one, the bottom panel which has the e-mail in it (preview at the top) takes up 100% width of the window. I need that left panel to be 100% height, and then the preview panel with the e-mails listed at the top (which it is) and the panel at the bottom that shows the e-mail at the bottom to fill up the rest of the window, if that makes sense.

I've added 2 screenshots. One for how it looked on my old computer and one for how it looks on my new computer. I want it to look like it did on the old computer.

I would also like to get the bar at the top back with the new messages, write, chat, address book, etc.

I have tried all the settings I can think of and things I've found online with no luck. Any help would be GREATLY APPRECIATED! TIA!

Hi All,

I'm having an issue with the font displayed in the message pane.

Below are screenshots of 2 plain text emails received by Thunderbird.

One email, created in The Bat on Windows, shows in the Courier New font, which I prefer.

The other email, created in Thunderbird on Linux, shows in some other font.

Shouldn't all plain text emails have the same font?

Also below is my Fonts... Advanced dialog box. This is a somewhat confusing screen, because it does not seem to assign fonts to specific elements in the program.

How can I have all plain text emails display with the Courier New font?

Also, how can I tell if an email is plain text or HTML? Is there some indicator in Thunderbird? In The Bat, an actual HTML icon shows as an attachment on HTML emails, and the plain text emails do not have this attachment.

And for some reason, Courier New displays very light in Linux, but darker and more readable in Windows. Is there any way to improve the quality of this font?

Thanks!

I read online that Firefox is planning on implementing AI features. Given the track record of AI in other browsers leaking private information, bogging down connectivity, and generally being a nuisance towards users, I was wondering if there will be opt out features in future updates? Or know of forum threads that will update with tutorials on how to turn off AI features?

If not, does anyone on this forum have recommendations for no-ai browsers?

Device name DESK Processor AMD Ryzen 3 3100 4-Core Processor (3.59 GHz) Installed RAM 16.0 GB System type 64-bit operating system, x64-based processor

Edition Windows 11 Home Version 25H2 Installed on 12/01/2026 OS build 26200.7623 Experience Windows Feature Experience Pack 1000.26100.275.0

Hello,

I have two windows in Firefox that I would like to tile so that I can compare the contents of each. Is this possible ? Regards

pyor66

When I click on a folder with multiple messages, each of which has a thread with multiple messages, all of the threads are automatically expanded. If I collapse each message thread, leave that folder, then return to that folder, all of the message threads are again fully expanded.

Is there a way to stop this automatic thread expansion each time a folder is opened?

New installation of Debian 13, Firefox setup with sync on successful. However, I wanted to add hone button and a few other mods to the toolbar but when I started customize the toolbar from menu pic the customization page would not work, it appeared and seemed OK but when I dragged and dropped anything it would not work. I could pickup items but they would not place in toolbar and just snapped back to the pallet. I tried several different ways to enter the customization area but it was always non-functional.

Hello,

I wanted to customize my Firefox new tab with a local HTML file, such as "/path/to/my/index.html". It was possible to use this workaround: https://github.com/Jangsoodlor/Firefox-New-Tab-Config/tree/main https://github.com/Jangsoodlor/Firefox-New-Tab-Config/tree/main

Which implied a configuration file (sometimes named "autoconfig.cfg", "firefox.cfg", "local-settings.cfg" depending on the guide since the name is arbitrary) with javascript code. In the new Firefox 136, this code fails to execute due to a new API being used.

If you want to customize your new tab, follow the previous guide, but on the configuration file write this code instead:

// My new tab
try {
  const ff = {};
  ChromeUtils.defineESModuleGetters(ff, {AboutNewTab: "resource:///modules/AboutNewTab.sys.mjs"});
  ff.AboutNewTab.newTabURL = 'file:///path/to/my/index.html';
} catch (e) {ChromeUtils.reportError(e);}

Note that the file must start with a comment

Adapting the "/path/to/my/index.html" to your needs.

Thanks to @mkaply (github) on this thread https://github.com/mozilla/policy-templates/discussions/1190 for the new API method.

I post this here in case someone has the same issue, because is quite recent and hard to find on the internet.

How do I change the email account inserted by Firefox when I click on an email link?

I have previously changed the main email address (added secondary address, swapped secondary for primary, deleted secondary) but when I click an email link in a web page to write an email to the web page business, the old deleted email account is used instead of the new one. This old address is not listed at all as far as I have seen in my Mozilla Account.

This is a similar problem to other threads, but I haven't found my solution there.

(1) Opened Thunderbird (128.8.1, 64 bit, Windows 10) this morning, and got "No messages found" in every folder, including Local Folders.

(2) Thunderbird still retrieves New (unread) messages, audio-announces them, and the header appears in the Message Header pane. But once they are read, the message header no longer appears.

(3) In Troubleshoot Mode, all messages are still there and visible. Turned all extensions and hardware acceleration off, and using the standard system theme. Problem is still there in normal mode.

(4) If I run Search, it finds all relevant messages, and I'm able to display them.

It could be a bug in the program, or I may have just accidentally changed some setting that's causing this -- but it sure would be nice to get everything back and visible. Help, please!