Make a folder in your profile called "chrome". No quotes of course.
Make a file in that folder called "userChrome.css" Again no quotes.
Paste all of this into that file: Start at the "do not remove" line.
If you don't like it, just delete the file. You have to restart TB to
make this work. This works for me. Also note the "Arial" font. If
you are using Linux, then you should make it something else. Liberation?
/* do not remove this line (and it should be one line */
/* this does an overal enlargment of fonts */
/* Shows up most on the menu */
/* all things like settings dialogs also show bigger. */
* { font-size: 16pt !important;
font-family: Arial !important;}
/* fix for too-tall dialogue where buttons are not visible, being off
the bottom */
#accountManager { min-height: 36em !important; }
/* expand the attachment name field size on the bottom preview pane */
#attachmentBucket, .attachmentBox {min-width: 35em;}
/* change font for things on account settings menu, */
/* won't change the actual setup window though */
label.iconic-label { font-size: 16pt !important; }
/* change the font on the tabs */
..tab-text { font-size: 18pt !important;
font-weight: normal !important;
height: 28px !important; }
..tabmail-tab { max-width: 350px !important; min-width: 300px !important; }
/* Text In Tab Labels And Tool Bar(s) */
toolbar {
font-weight: normal !important;
font-size: 18pt !important;
background-image:
linear-gradient(to bottom,#EBEDFE,#B5B3FF) !important;
}
#tabs-toolbar { background-color: #D4D4D4 !important;}
/* Menu font Top of the window File/Edit etc */
menu, menulist, menuitem { font-size: 18pt !important; margin-top: 0px
!important; height: 22px !important; }
/* this darkens the line use in the headers to link threads */
tree[seltype="cell"] > treechildren::-moz-tree-line,
tree[seltype="text"] > treechildren::-moz-tree-line,
treechildren::-moz-tree-line { border: 2px solid #285AB0 !important;}
/* Folderpane - Text background and color of folder when email is
selected */
#folderTree treechildren::-moz-tree-cell-text(selected) {
background-color: #F0F0F0 !important;
color: #000000 !important;
}
/* Folderpane - background and color of folder when first selected */
#folderTree treechildren::-moz-tree-cell-text(selected, focus) {
background-color: #6060FF !important;
color: #FFFFFF !important;
}
/* Found in TB support group relating to ver 24 of TB */
/* Change the colour of unread messages and containing folders*/
treechildren::-moz-tree-cell-text(folderNameCol, hasUnreadMessages-true) {
color: blue !important; font-weight: bold !important; }
/* make account with new mail red and bold */
#folderTree > treechildren::-moz-tree-cell-text(isServer-true,
biffState-NewMail,) {
font-weight: bold !important; color: blue !important; }
treechildren::-moz-tree-cell-text(folderNameCol, specialFolder-Inbox,
newMessages-true) {
font-weight: bold !important; color: blue !important; }
/* Set Font Size In Folder Pane */
#folderTree >treechildren::-moz-tree-cell-text {
font-size: 15pt !important; }
#threadTree >treechildren::-moz-tree-cell-text {
font-size: 17pt !important; }
/* After adjusting the font size(s), */
/* you find that the spacing between the lines also needs adjusting. */
#folderTree >treechildren::-moz-tree-row { height: 22px !important; }
#threadTree >treechildren::-moz-tree-row { height: 26px !important; }