Graphical programs are such a pain sometimes. I am of an age where 1024×768 is the highest resolution that I can see. I had set my Windows 7 system fonts to be 125% – that helps a lot – but it screws up the tool bars on many other programs so I've reverted to 100% and it's now too hard to read in many cases.
Most browsers will let you easily scale text font size as will the "message" window of Thunderbird (aside from setting the default font size for reading messages to 24 point, CTRL + + works wonders). However, I cannot seem to find a way to set the font size for the other panes – the Folders pane and the inbox pane.
Is there some undocumented way to do that?
Best Answer
Apparently, you can customize the CSS of the UI by editing the useChrome.css file.
More on that topic here: http://kb.mozillazine.org/UserChrome.css