Safari has tabs. You just have to enable them in the Preferences.
I'm a Firefox user. I keep trying Safari, and like it, but then I'll want something in a contextual menu or something equally inconsequential, and I revert to Firefox, yet again. (If for no other extension than FoxMarks.......a way to keep all bookmarks synched without a .mac account).
For heaven's sake, don't enable the feature in FFx to auto-download and install the latest updates! 2.0 was a beast until the tweaks got sorted out (the flash plugins especially were horrendous). I'm still on 2.0 on the desktop, 2.0.0.1 on the Macbook. There are extensions that I use a lot, but aren't available yet for 2.0.0.2 so I refuse to update automatically. Usually stuff updates in a couple of weeks to a month (remember, the core is good, it's the extensions or themes that often don't work, or outright conflict after an update).
That said, I'm still waiting for the fix for the contextual menu options from the tabs bar, and for the ability to hit alt/s (I know, it's the windoze shortcut) to send a message via BB.
I've been in about:config, messed around, defaulted back, and still can't get alt/s to work, or any combo thereof.
No matter. Firefox is still my browser of choice, you just gotta mess around with it and add what you want to it to make it your pwn!