If you’re using Firefox on OS X, you’ve probably seen the Flash problem. Bug 106397 describes the problem pretty well, basically Flash is hella slow, can lock up or even crash Firefox and the only way to try to recover is to hold down the mouse button. It is by far my biggest complaint with Firefox, and Mozilla in general. My favorite part is that the bug was opened in late 2001 and still hasn’t been resolved, 2 1/2 years later.
Safari isn’t a much better alternative, due to the fact it sometimes gives me the spinning beach ball when I load Bloglines or when I click on a mildly complicated form. I wish Apple had put its energy into Gecko instead of KHTML, but I suspect Dave Hyatt got tired of being frustrated with Gecko on Camino and wanted a new type of frustration.
I’m probably going to have to start playing with adblock, which kind of sucks because I don’t want to deprive sites of their income. On the other hand, I rarely click ads anyway, so it won’t be a huge loss to anyone.