Hi, As it says in the linked page: "This will not prevent the machine suspending when power is low but will prevent the system suspending for the reason that it is not being used."
-- Firefox should inhibit Gnome Power Manager from suspending due to inactivity when downloading https://launchpad.net/bugs/49254 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
