Thank you, rafaelluik. I've started the other post about font size and I was quite surprised that almost no one cares about this problem - on most web pages letters are so small, that you can barely read them while walking. I like your solution with minimum font size, but in my opinion, the main problem here is that new version of Opera doesn't allow to change almost anything. Even in Opera Mini you can set font size (granted, only in 3 steps) and in older versions of Opera (Mobile) you could tweak a lot of different options.
Anyway, if you don't care about a volume of transfered data and have at least 1GB of RAM in your device, I can recommend Firefox as much more powerful browser with very good web page compatibility.