If the screen DPI is bigger than 100 DPI (I have in my laptop 115 dpi), then mozilla thunderbird display fonts in the lists of the mailboxes in wrong way. The lines of the list overlap together, and are difficult to read. When I switch the dpi of screen in the thunderbird into 96 or 72 dpi, then then the lists are looking OK.
I should add that this happen under KDE
What version of thunderbird? Have you tried 0.7? Please post output of emerge --info
I have tried with versions 0.5 and 0.6 I will try with 0.7, and then write a comment.
Created attachment 33544 [details] Result of command emerge --info There is my emerge --info
OK The version 0.7 of Thunderbird work correctly.