Used Firefox earlier, 0.7 (Firebird) and 0.8, but then Safari got its act together and I switched. A couple of days ago I again gave Firefox a try and now I've changed back.
The main reason was the extention Adblock, which allows me to filter out those annoying flash-based ads without killing all support for plugins, as I had to do in Safari.
Other advantages with Firefox:
- can allow some sites to open pop-ups (the wireless netwoork at school has a portal solution where I have to have a pop-up window open to have access).
- my internet bank works again (the b*stards recently "upgraded" their bank, and I can no longer use Safari)...
- I can add separators in the bookmarks, which is very handy when you have a lot of bookmarks, and try not to have too many folders in the bookmarks bar...
- Firefox displays the contents of the alt-tag when an image is missing, while Safari only has a stupid questionmark...
- the Searchbar at the bottom of the screen is fantastic, and makes Safari's (and all other browsers) Find-window seem like dark age technology.
- Firefox has RSS-support, which Safari still misses...
- Send Link... is missing in Safari **
- Asks if you really want to quit if you hit cmd-Q with more than one tab open... hasn't got a count of how many times I accidently hit cmd-Q in Safari when I was aiming for cmd-W (right next to each other), and then 'lost' all my tabs and had to go through History to get them back... **
For the moment I recommend Firefox.
Can't wait to see what Safari 2.0 brings, though, if the issues above is solved I gladly switch back.
** Edit