Yes, the printer adds itself whenever I plug it in via USB. I have two (yes two) brother printers that use the same driver (HL-2040 and MFC-7420), same on both.
When I browse to localhost:631, I see the CUPS page right away. If I then browse to /printer, safari eventually errors this:
"Safari can’t open the page “
http://localhost:631/printers/”. The error was: “Operation could not be completed. (kCFErrorDomainCFNetwork error 302.)” (kCFErrorDomainCFNetwork:302) Please choose Report Bugs to Apple from the Safari menu, note the error number, and describe what you did before you saw this message."