Dear Log,
I can't stand the default appearance of Thunderbird on my system: it's like staring into a lightbulb. I like things darker.
So, possibly forgoing any number of more proper or comprehensive ways to do it, I found that I get pretty close to what I want by creating a ~/.thunderbird/STUFF.default/chrome/userContent.css file consisting of this:
body {
color: #ffffff !important;
background-color: #22095b !important;
/* line-height: 1.25em !important; */
}
and then a
~/.thunderbird/STUFF.default/chrome/userChrome.css
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
tree {
color: #ffffff !important;
background-color: #22095b !important;
border-color: #8f8 !important;
}
treechildren::-moz-tree-row(selected) {
background-color: #52398b !important;
}
.headerContainer,
.headerContainer * {
color: #ffffff !important;
background-color: #004 !important;
}
.headerName {
font-weight: normal !important;
}
This is part of my grand, emacs-inspired, plan of learning to customize apps without feeling obliged to first digest a whole massive manual/reference to every last detail of the relevant app's internals. This helps me cope with The Nightmare.