I use firefox on ubuntu as well and it works very nicely. Its RAM and CPU usage is negligible, sites load very fast, and the developer tools are awesome.
I think something is wrong on your system.
I think something is wrong on your system.
That said I still use and prefer Firefox, but I also have to open up Chrome probably once every few weeks for various reasons, and it has occasional abhorrent behavior that I don't experience with any other program on the same machine.