You could try non-ESR Firefox first, I do not have such problem with it (11-STABLE amd64, heavy use takes half of a physical RAM, no swap). Alternatively, try just clean profile with Firefox. There is a lot of settings that could affect that (e.g. loading tabs in the background). -- Sent from: http://freebsd.1045724.x6.nabble.com/freebsd-ports-f3835061.html