Opera extensions have been downloaded over 1 million times in just 4 days after Opera 11 was released. Lets take a quick look at some more inspiring numbers and statistics. 20-30 new or updated extensions uploaded each day. Over 244 extensions now available!
The problem I see, is that all the good FireFox extensions are for program features Opera has built in (ad blocking, mounse gestures...etc). So alot of the fanfare that FF gets for extensions, just isn't needed in the Opera world.