Or at least not before you check out threads like this: link, link.
It's slo-o-o-o-ow. I mean we're talkin' Soviet-bureaucrat slow, cold-molasses-running-uphill slow. Like type-in-a-command-and-go-make-yourself-a-cup-of-coffee--and-come-back-and-watch-it-execute slow.
Or it is for me. My friend Daniel says he has put it on several machines without problems, but those comment threads cited above convince me that I am not alone.
While I am whining--my two-month-old Iphone is reporting "microphone not found." Again, a check of comment threads makes me believe that I am not alone; also that there is no easy solution that does not involve $$$. And you have no idea how many people think it is funny to say "solution: go and find microphone." A real knee-slapper.
Update: Thanks for many helpful comments, public and private. I did solve my mike problem, in the most old-fashioned way:--by deleting and reinstalling. Would be a nuisance to do that every time, though. Re Firefox, I guess I have to acknowledge that not everyone has my problem, but apparently many do. I have to laugh at the suggestion that I solve it by getting rid of add-ons--aren't add-ons supposed to reduce performance, not inpair it? Anyway, I checked a list of the most bloating addons and I have none of them. So for the moment, despite years of commitment, I'm dumping ol' FF for the younger and more supple Chrome.