@achhid It worked. I think this has to be some kind of a bad joke...

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.

I don't get why this doesn't bother more people, font is so small, that you really can't read while walking.

Is there any option to change font size in newest versions of Opera for Android? Opera:config doesn't seem to work any more.

I like Opera for its data saving mode but I don't get why you can't configure almost anything in it. I was using Opera Mini where you can at least choose from 3 different font sizes but Opera Mini has quite a bad compatibility with a lot of web pages so I wanted to switch to another browser with data-saving capability. Google Chrome can compress data too, but not as well (you can't change picture quality which costs most of the data traffic).

Thanks for advices.