FWIW - firefox has supported multiple profiles for years, long before Chrome even existed.

Run it with the following command-line arguments: -ProfileManager -new-instance

That brings up a profile picker/creater. Each profile is isolated, different plugins, different cookies, etc. The only information leakage is when a plugin keeps its own data outside of the profile directory, like Adobe Flash keeps its version of cookies in a per-user directory rather than a per-profile directory.