Well you can build up your own Firefox with
http://extensionroom.mozdev.org.
And you should have in mind that Firefox is still BETA (btw, expect 0.9 release really soon
)
Firefox being open source is also an advantage for the future, since there will be always somebody working on it or on extensions for it. So it's basically unlimited in features.
I have a plugin for my RSS feeds, a plugin for IRC, a plugin for gestures and the googlebar (the big one, not the standard searchfield).
If there's anything I want firefox to do I can code it (if I knew XUL
) or look for a plugin.
I have tested Opera on my linux. It's very good, I must reckon, but that banner...
Btw, is the old good BrowSeSiDe (Browser Server-Side Detection) still working??
Edit:
it doesn't