I desperately want to switch to Safari/WebKit for casual surfing, it's a lot faster, and it just feels more responsive. I have to use Firefox for development, there is no way I could live without the Firebug and Web Developer plugins.

But I can't use Safari because it's missing a few features that I depends on constantly. First of all, it doesn't save your tabs when you quit or it crashes. Saft us supposed to do that, but I don't trust it yet, also it's annoying and I hate the name. Plus it's free in Firefox.

Also, it doesn't handle tabs very well. I routinely keep about 60 tabs open with pages of information that I'll need to read and process. If I bookmark the pages, I'll forget and never go back, so I keep them in tabs, and eventually I get to them. I blame that large number on http://programming.reddit.com .I also discovered that Firefox gets cranky when you have over 95 tabs open. Whoda thunk?

Beyond that, no Del.icio.us plugin - why would I not bookmark in a central location ?

So there are still some hurdles. Also, Firefox 3 nightlies are pretty fast, though I haven't tried them under full load.