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Hi all,

I tried to change the appearance of thunderbird using a userChrome.css file.

• I am sure it is located in the correct profile folder and has the correct name userChrome.css
• The userChrome.css file is also visible in the style editor of the development tools and displays the correct contents if I edit the file.
• I am sure that the toolkit.legacyUserProfileCustomizations.stylesheets is set to true
• I restarted tb millions of times

The contents of my userChrome.css file are currently (but I also played with different content):

/* Change background color for read messages */ treechildren::-moz-tree-row(read) {

   background-color: #f1f715 !important;  
   color: #6564cf !important; 

}

In the style editor, if i try to change the color code in one of the lines, it gives the following error messages:

Error while calling actor 'stylesheets's method 'update' document is null Actor.js:103:13

   writeError resource://devtools/shared/protocol/Actor.js:103
   handler resource://devtools/shared/protocol/Actor.js:242

InvisibleToDebugger: TypeError { } Actor.js:110:15

   writeError resource://devtools/shared/protocol/Actor.js:110
   handler resource://devtools/shared/protocol/Actor.js:242

I am running thunderbird 128.3.1esr (64-bit) on mac sonoma 14.6.1 (23G93)

Does anybody know how to get the style sheet running?

Thanks, ulrike