Originally Posted by UAVirgin
... My philosophy is: If it's in a browser it should all be doable with the mouse via a click (left or right) or a scroll. ...
Then, have you looked at this:
Firefox Help - Mouse Shortcuts.
It is a matrix comparing mouse shortcuts in all three browsers. (The menu on the LH side of that page has more useful links.)
This matrix is possibly lacking, though, I recall many more 'mouse gestures' (I think that is the correct term) that Opera has but that I don't see listed.