Opera is my third favorite browser:
1. chrome
2. firefox (3.5+, latest dev is much better than 3.5)
3. opera 10+ (opera 9- are not as close)
Try chrome 4.x (dev versions), you won't be disappointed (much faster, more features, webkit, fastest javascript by far)
Chao,
it's not far away:
antiads (better than adblock+ for chrome), greasemetal (don't use it, but supposed to be the same thing as greasemonkey) - noscript = ehh, not yet
They aren't as mature or implemented yet because of a lack of chrome features yet, but i'd give it a month or two and probably see these limitations removed.