I think we could try to enable this. I've been running Linux Nightly with the pref enabled for months, and haven't noticed any issues, FWIW.
Bug 1406865 Comment 14 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
I think we could try to enable this (once we've addressed, or annotated [if we must] the test-failures that Emilio noted). I've been running Linux Nightly with the pref enabled for months, and haven't noticed any issues, FWIW.