Something like I ask in my last thread, Do you know what kind of API didn't they use to hide or remove the ad from display to the use ? Thanks.

Just read this out of interest Arion. In case it helps you, my only language is English (I'm UK born) and I don't understand your question. Perhaps you could put it in a different way?

They use css rules to hide elements.
The best way to learn is just look at their code. Crx files are just zip files, use winrar or something to open them and have a look at the source.