Firefox went crazy

[csodabogar]

I started Firefox and it has some idiot fonts, athough I didn't change anything. They look like some arbic characters and are very hard to read. This font problem is present in the addess bar, menu and bookmarks too. I verified if font settings have been changed, but found nothing in Firefox options or in Control Center.
I mention that I updated some gtk components theese days. I have a persistent image on my flashdrive. Booting was regular (myconfig=scan)
How could I fix that?