Firefox has had profiles since at least 0.8, released in 2004, when it was renamed from Firebird, more than four and a half years prior to Google Chrome's release. This code, however, was inherited from Netscape Communicator 4, released more than a decade before Google Chrome. Hell, Netscape 4 predates Google!

However, since the profile code is so old, it is not accessible from the main interface; it must be accessed via a command line flag. Chrome learned from this mistake and exposed it in the graphical interface.

It is utterly false however to say that Firefox does not support profiles.