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As per my title, where can I find a themes toolbar background image and change it? I have tried looking for manifest.json and header.png files for the theme but I can't find it.

Or is there a way I can override it using CSS somewhere?

Windows 11

Cheers

GW

Does anyone else have the issue where the interface just looks bad? It's like I'm using an old version of Microsoft office on a Windows 3.1 machine. I see in the settings I can change the font sizes for composing emails but how about the system interface? Others say "just download a theme" but could someone recommend one? This current font makes me want to delete this software and look for alternatives. I only checked out this software because Microsoft sucks. And I'm about ready to leave this one also.

Thunderbird version 142.0 (64-bit) Windows 11 build 26100.4652 Intel Core i5-9400F 32GB ram

Greetings!

I downloaded a theme that I really like for Thunderbird, but I would like to ask for your help. I would like to change part of the frame to a different color (similar to the one on the left), but I don't know how to do it. I am attaching a photo where I have circled the part I would like to change with red lines.

Thanks for your answers!

Igor

My question: is there a way to force a light TB theme and use white tab background text color?

I installed a theme add-on which I like except the associated dark theme. I want to use the theme image with a light TB theme but it appears the tab background text color determines the theme color (light or dark). This image has some darker colors and a light/white tab text looks the best, but this color seems to force a dark theme for the rest of TB (White text ->dark theme). If I change the manifest file to use a different tab background text color I can change the overall theme to light or dark. Using a darker or black tab background text color the theme changes to a light theme. Light tab background text color changes to a dark theme and darker tab background text colors forces a light them. I'm guessing there is a threshold 1/2 way between black and white text that will force the theme one way or another.

The articles I have read on this json file don't provide any examples and this is as far as I have been able to get. I'm new to both TB and modifying this json file. Any help would be appreciated

I am trying to change my Theme and every time I enable a new theme, it changes for a minute but then it reverts back to the old theme that I can't even find anywhere in Thunderbird or on my computer. How do I get the new theme to "stick"?

Hello Mozilla Team,

I would like to request your assistance with an issue regarding complete themes on thunderbird.

The issue here is that I simply cannot install any of them, no matter which one. I've checked multiple and they all display "This add-on is not compatible with your version of Thunderbird. " I am running Thunderbird 128.7.0esr.

I am able to download the normal themes and other add-ons just fine, but I was really looking forward to complete themes.

My PC specs:

Ryzen 5 3600 GTX 1660 SUPER 6GB 16GB RAM SSD 500GB

Windows version 22H2 19045.4170

I hope you are able to assist me on fixing this issue.

Thanks.

After upgrade Thunderbird to Nebula Almost all themes have the problem or the error that they change the design when I click on compose new mail, for example. And this design is unfortunately almost illegible. What can I do?