Recently switched to Safari to just try it out. Finding it to be good in terms of speed and rendering of sites. But of course not without irritants.
- No way to add more search providers – Locking to Google is CRAP! There seem to be workarounds but nothing works for Windows. The preference file is RSA signed. Why the hell would someone do that! Isn't this anti-competitive?! And btw, I love Bing. It's yet to be polluted with SEO junk.
- No undo closed tab - A problem that I get into very frequently. I'm one of those who close tabs inadvertently. And when the competition has it and as a user I have had a taste of it (including in IE8) why would I want to miss it.
- No process isolation - One crappy site, one tab hangs and you lose all your work? Oh come on!
- No recent tab order - Again having had the taste I'm missing this.
- Address completion is still naive - If you can optimize your algorithm to ignore the beginning "www" why not optimize it a little more search across words.
- No private browsing. - There, but!! What's the point if Google gets my cookie when I have chosen to browse in private! Why the hell did I turn on Private Browsing? To hide history in my browser but expose it to Google? Come on, guys! That's ridiculous.
- 280 MB for just 5 tabs in windows is ridiculous. I mean, seriously, not even Intellij Idea requires so much memory.
- Missing about:config or similar powerful preferences editor.
- Plug-in support - Same problem as IE. But IE is at least popular enough to have the most essential plug-ins.
- Clearing private data – Firefox beats everyone else.