Thunderbird

Change the selected row color

create a file named userChrome.css in the directory

$HOME/.thunderbird/{profile_dir}/chrome

With following content (replace #FFD445 and #000000 with your favored color):

@namespace url("[http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul](http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul)"); 

#threadTree treechildren::-moz-tree-row(selected) {
background-color: #FFD445 !important;
}

#threadTree treechildren:-moz-tree-cell-text(selected) {
color: #000000 !important;
}