Whether you have multiple users or just want different setups for work and play, multiple browser profiles are handy. Instead of going through the trouble to set them up, though, reader cbstryker recommends just using Chrome and Chromium side-by-side instead.
Windows: Google’s Chrome browser doesn’t have nearly the same kind of user profile control that Firefox offers. Until it’s baked in, we have ChromeDeck, a handy utility that creates, manages and produces shortcuts to multiple Chrome user profiles.
Navigating to the directory where Firefox stores your profile has always been a bit of a pain, but the recent release of Firefox 3.6 makes finding that folder — and from there backing up your bookmarks, extensions or entire profile — a breeze.