"One of the big things that Google Chrome introduced is the idea
of out of process plugins. It's something that has now (finally!)
landed in Mozilla -- albeit in the Alpha 2 release of Firefox 3.7
(officially called Mozilla Developer Preview 3.7 Alpha 2).
"When I visited Mozilla Toronto back in January, Mike Beltzner
Director of Firefox explained to me what the big deal was with
out-process-plugins (read the linked story for full details)."