These instructions will be difficult to follow if you don't have Greasemonkey. On the Greasemonkey button, click New User Script. Make like this. Then you'll want to make the texty thing that opens next like this. If people manually select Arial/Helvetica because that's the way they want their post to look, that's how it'll look - this only changes the forum's default font. Make more lines but have them say "/arial/i" and things like that if you also want to replace those.
Here's the Javascript-free way, using css with Stylish edit: see below This also fixes the delay in loading a page javascript uses. Forgive the formatting, it's ugly but using bbcode for code screws up the url for some reason.
Select "Write New Style" and paste this. Code: @-moz-document url-prefix(community.gaslampgames.com/) { html{ font-family: Georgia !important; } body{ font-family: Georgia !important; } .message .messageText, .message .signature{ font-family: Georgia !important; } } Insert http:// before the community there, I had strip it so code wouldn't screw up.
Np, I just might work on a sort of redesign (at the least, fix sizes of stuff since changing the font makes it look a bit weird.) if I have some spare time, gives me some CSS practice. If I end up with something decent looking I'll release it.