https://bugs.freedesktop.org/show_bug.cgi?id=104216

--- Comment #26 from Michel Dänzer michel@daenzer.net --- The question remains where all the file descriptors are coming from. Maybe there's a leak somewhere.

FWIW, I've never noticed such issues with the default limit of 1024. My main firefox process (which has been running for days, with lots of activity in a large number of tabs) currently has 222 open file descriptors, the helper processes less than 60 each.