Windows10 Home.
This is my userchrome.css which is working fine in TB 69.0b4 (64bit) but
did not work for some reasons in TB 68.0 (64bit)
Start paste:
@namespace
url("
http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
/* Global UI font */
*{ font-size: 14pt !important; font-family: Georgia !important; }
/* After adjusting the font size(s), */
/* you find that the spacing between the lines also needs adjusting. */
#folderTree >treechildren::-moz-tree-row { height: 23px !important; }
#threadTree >treechildren::-moz-tree-row { height: 23px !important; }
/* make lines for threaded msgs solid black */
tree[seltype="cell"] > treechildren::-moz-tree-line,
tree[seltype="text"] > treechildren::-moz-tree-line,
treechildren::-moz-tree-line { border: 1px solid black !important;}