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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

Hi I see that Firefox has the option to ask an AI chatbot, with your options for AI being Claude, GPT, Gemini, and Le Chat Mistral. What I'm not seeing is an option for Lumo, Protons new chatbot. My question is is there any future support coming for Lumo, or better yet, an option to let FF users choose ANY chatbot, not just these 4?

Good day! I'm using version 137. How do I sort messages from fresh to old (from top to bottom), and not the other way around? My correspondence can be very long, and it takes a long time to find what I need. Previously, this could be fixed with plugins, but now they don't work.

I've searched in 'Settings' and on-line and cannot find how to set the line spacing in composing a message to single line. There are lots of answers but they all talk about the 'Composition' section in settings, which sounds logical, but it does not appear in Nebula Any help would be most appreciated Regards Greg

View > Folders > Folder Pane Header [v] All Folders All folders is greyed out (cannot select).

I believe being able to make this selection would cause the email account name to display expanded selections. I want to be able to select this for all my email accounts to display properly in the Folder Pane: (example) Inbox Drafts Sent Spam Trash

Uploaded images are:

1. 1. View > Folders > Folder Pane Header > [v] All Folders > All folders (is greyed out - cannot select).
2. 2. My email client name list with no expanded selections.
3. 3. An example of and expanded email client name

Any help would be greatly appreciated.

Thank You

Is there a way to sort Favorite folders? I've tried dragging them to a new order with horrible consequences. Instead of changing the order, the actual folder was moved to a sub-folder position within the actual folder I was trying to move to the position beneath it.

In other words, if I have Favorite folders: A, B, C, E, F, D and I want to move Folder D to the position after C and before E, dragging D to C will cause the physical location of the Folder D to be moved to a sub-folder position of Folder C in the email account.

If you then move it back to it's correct position AND folder D had sub-folders as well, you will then get the error message for any of Folder D's sub-folders: Unable to open the summary file for FOLDER D's SUBFOLDER NAME. Perhaps there was an error on disk, or the full path is too long.

BTW: is there a way to fix that error as well?

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.

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.

The font size in "Manage Bookmarks" is way too large, both in the sections list menu on the left and the list of bookmarks. I checked my userChrome.css file as well as the layout.css.devPixelsPerPx entry in about:config and there's nothing there to explain why only the "Manage Bookmarks" text is so large.

It's possible I changed a setting somewhere that's causing this. But I'm stumped re: what setting might be controlling the font size in only that UI. All other Firefox text sizes are good.

Thanks to anyone who knows where I should be looking

Firefox 134.0.1 (64-bit) Windows 10

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 opened Firefox today to find that nothing would show up, at first I tried clicking on the icon on the taskbar, but it just made the icon bounce with the window briefly popping into view. That's when I realized that Firefox was completely offscreen and unusable.

For context, last night, I had 3 windows open, two were regular sessions, the last one was a private session I had open on a temporary second monitor that I unplugged afterward. My dad lended it to me, so I'd rather not ask him again unless I absolutely have to. I closed them in order making sure to close the default window last thinking that Firefox would open there next time I launch it, but comes tomorrow and when I launch Firefox it opens off-screen and I can't interact with the window at all.

There also seems to be no way to bring it back directly to my screen on this garbage OS everyone calls "windows 11" according to their help forum: https://learn.microsoft.com/en-us/answers/questions/4139775/app-runs-off-screen-in-windows-11?page=2#answers

So, I'm commenting here via brave browser, first to report a bug because I don't think Firefox should remember the last position of a private window of all things, but also because I don't know where else to go to ask that question since windows 11 itself cannot seem to have an option to solve this problem either. I know the position is stored in the profile folder, so what should I edit in there to get Firefox back where it should be? No, I will not delete/reset it it has a ton of search engines and settings that Firefox won't sync.

I updated to Thunderbird v.136 last month and lost the ability to customize the color of text when either creating a new message or replying to a received message.

In Settings on the Composition screen under HTML Style, I select a blue color for Text Color but when I compose a message I only get black. Before I click in the area of the message to type text, the color box shows the blue color, but as soon as I click in the area to compose text, the color box changes immediately to black.

After I have typed that black text, if I select the text & click on the color box to change to color to blue (or any other color), the text stays black.

How can I have colored (non-black) text in messages I compose?

Is there a button I push or a feature I enable to make sure that I'm opted-out of any future updates that include AI 'features'? Or should I switch to Vivaldi now and save time?

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 used to have an icon to change how the message list was displayed, and in particular it allowed me to sort emails into either threaded or unthreaded. It was next to the icon used to select columns to display, in the top right corner of the pane. It's disappeared and I can't find out how to get it back - can anyone point me in the right direction?

I've installed the latest desktop version of Thunderbird to evaluate. The signature is added only for new messages and not included when replying or forwarding a message. I've tested the signature with both plain text and html signature - both doesn't work as expected. I've also tried pasting the html code in the input field and attaching it as a file. Is this an intentional omission of functionality or I'm I missing something? I'm attaching my account settings interface.