Laisvunas,
I'm running FF 3.6 and the font size feature works very well with both the buttons and the preference dialog.
I think I may know why it does not work in your case : I once had this problem with my Sony PRS 505, when I manually edited the CSS file of a Calibre-converted ePub book, and ended up specifying font sizes using points instead of ems...
Maybe that's the problem ?
Cheers,
David.
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