omniweb and firefox are great, a con for firefox is that it doesnt auto login to things like safari does, and it asks for my password every single time I open the app, it says a password is required to use it, but I havent enabled any sort of security.
a pro of firefox is plug ins, like the g-mail plugin, it checks for me and displays it at the bottom of the window. omniwebs tabbed browsing is superior to all browsers to date, another pro of omniweb is you can save workspaces, like in photoshop, a con of omniweb is it is sorta a processor hog.