I have a number of staging and test servers that I need to constantly modify my hosts file to access (they depend on the domain name, so i have to change the hosts file to get them to work).

I find this annoying. I'd like to setup a portable browser of some kind for each kind of site i want to work with. Is there any version of any graphical web browser (including browsers based on the rendering engines of other browsers) that will do this?

This way i can simply launch the instance that's already configured to work with staging if i want to test staging.

Any ideas?