I just can't get used to Firefox. Last time I tried it (earlier this year), I tried for 2 months. Can't remember all the reasons, but using the adresbar as calculator and see the results without pressing enter is so ingrained in my way of working. Just alt+d, 2+2 shows the result. Give me something better than that and I'll give Firefox an other shot.

Edit: lol at my downvotes. That's what I get for asking a genuine question I guess. People really looove their Firefox here. (me too, but I'm missing some features)