you can install in by going to installer in applications, right clicking, ans selecting run in rosetta. install, it, return the install tool back to NOT run in rosetta, then run your browser in rosetta, and it should work fine,
hope that helps
rosetta will slow down your browser a bit, so you could always have 2 browsers installed, one set to run in rosetta, and one not!
hope that helps, let me know how you get on
cheers