What userChrome element is this background color?
What is the name of the element that corresponds to the background color of this message pane? This is a default background of a message window when I first open Thunderbird. I already have userChrome setup to modify other elements and I attempted to use the inspector tool to try to find the name of the message background color but I could not identify it. Please provide the name of the element in the form that I can use to add to my existing userChrome.css file to customize this black window pane.
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The black background seems to be due to the dark theme. Unfortunately your screen shot is so blurred that I'm unable to imagine whether you show the thread pane or the message pane or both. But since you mention the message pane here is the CSS code which I'm using in my userContent.css file:
HTML, body { background-color: #e8edf2; }
As with the userChrome.css file, you have to create the file it in a text editor and then move it to the chrome folder in the Thunderbird profile folder. The actual Thunderbird versions don't display the userContent.css file content in the developer toolbox. So if you want to modify the colour code you'll have to do it with a text editor. If you choose a light background colour your white font won't be readable and you would be obliged to add a dark font colour CSS such as
color: black;