Is it possible to run three versions of Google Chrome?
Google Chrome Canary is a bleeding-edge version of Chrome which uses its own profile, so it can be run in parallel to a regular copy of Chrome. The Canary browser is the least tested version of Chrome in their development pipeline (Canary → dev → beta → stable), but contains the newest features. For this reason it may not always work as expected, or sometimes not at all. It receives updates every single day. This SO post describes it in more detail.