When you compare this with the much more complicated process in Firefox you cannot help but congratulate the Google guys for making this happen. Well done!
Google Chrome Extensions are just simple HTML5 apps in a small screen, that you access them through clicking an icon. So they can't be complicated. In Firefox it's a different thing, you have access to the whole browser and you can change anything. You can even integrate "DLL (C code)".
I should know, I currently run both Adblock and Flashblock.