Hi, everyone.
I recently installed Mint 12 KDE, and there are two things I would like to do:

1.How can I change the font in Firefox, so as to make it more rounded, like in
Gnome? I've changed it through Preferences, but nothing really changed much.
2.How can I upgrade to 4.8, since the one I'm running is 4.7.4?

Many thanks in advance.

Issue no 1 is solved.
I just enabled sub-pixel rendering και Hinting (slight), and gave a font size of 12 (Ubuntu).
As far as the update to 4.8, I don't know...