...I can't understand what you mean, the only thing that 'suck' are embedded videos, flash or even webm are VERY slow on the browser, but if you download them you can play the files with vlc, mplayer and so on without issues (720p and up videos are slow anyway)
The navigation is great with firefox, you just have to learn how to use effectively the hotkeys, cause I'm currently writing from my Pandora in fullscreen but with 5 tabs opened (including GMAIL with full interface and chat), and I can go from one page to another with CTRL+PageUp or PageDown (in this case the right shoulder button and the Y/X gaming keys, sooo convenient) or I can go forward and backward in the visited pages history by pressing ALT+LeftArrow or RightArrow, and so on..
I prefere surfing with this than my PC. You just have to LEARN a thing or two before using effectively this thing, for example what is a swap file and so on, but after that you are done
EDIT: just to be precise I'm using Firefox 11 with a 512mb swap file on SD (thanks Slaeshjag) and the old kernel so I'm using only 256mb of the Pandora RAM... this means that the experience can only improve