Thank you, but unfortunately that did not help.

@ VAD_M   Thanks for the tip ! But the "Edith Wath?" I am also very interested!

Greetings Ebs

Edit the "th.css" directly! Copy th.css to some safe place. Then open th.css from C:\Program Files (x86)\Stardock\WindowBlinds in any text editor like Notepad ++ and create your own css which will be used when you run the Thunderbird.

Here is my code for Thunderbird 52.9.1 (you may use it as an example):

https://cdn.stardock.us/support/uploads/thunder.txt

 Hello Vad_M,

thank you for the "long" answer! This is a few numbers too big for my little knowledge and I feel helpless.

Greetings Ebs

Which line would have to be edited? That there code is a bit much and not knowing where to start is nerve wracking.

I made what you posted into a text file, uploaded it, and posted a link as it was way too long for the thread to be easily read.

----------------
Sean Drohan
Stardock Customer Service Manager

Thank you!

You do not need edit anything! This is a fully working css which I use on my Windows 10 PC. To try it just replace the content of your existing "th.css" (leave a copy in a safe place before!) with this code, save the file and restart Thunderbird.

Hello everybody,

girls / boys, you are just great !!!       

It works flawlessly with the new "th.css"!

Thank you very much!

Greetings Ebs

  By the way, I can publish the similar ff.css files for Firefox 52+, Firefox 60+ and even Tor Browser 8+  (if you show me the right way to upload large blocks of code here ...)

 !   !   !

You are now the Thunderbird guy  - sending all such tickets to you - you brought this on yourself 😂

Thanks for your help, Vad_M, really.

----------------
Sean Drohan
Stardock Customer Service Manager

Not at all, Sean!

So, can you help me to post all other css files with the small instructions (if it's necessary, of course)? It will be a few thousand lines of code for Windows 7 and Windows 10 and for the different versions of Firefox, Thunderbird and Tor (ff-52+ win7, ff-52+ win10, ff-60+ win7, ff-60+ win10, th-52+ win7 and tor-8+ win7, tor-8+ win10).

It seems to me that any problems with Mozilla products skinning will be solved...

If you write something up, Ill review it, and consider making it part of the FAQ here:

https://forums.stardock.com/486023/windowblinds-support-faq

You can email it all to sean.drohan@stardock.com. Attach any files with it.

Thanks again.

----------------
Sean Drohan
Stardock Customer Service Manager

Some skins work on 10.262 and 10.267 such as Brainstorm and Kal_El as long as you don't have windows at full screen.  I'm not sure what the differences are between those an other skins, but at least there are a couple of options.  Hopefully this helps the developers.

Thank you! Email sent with the subject: "CSS Styles for Mozilla products".  

This just happened. Chrome is overlapping the title bar of Icebabee's Punked WB. This also happened with adni18's A Steam Punk WB and with other WB's.