This is a useful pref for logging JS script. It would be nice to have it show up in about:config.
Created attachment 575336 [details] [diff] [review] patch Wasn't sure what the best reviewer was for this. Tried to guess from hg blame.
Comment on attachment 575336 [details] [diff] [review] patch Sure.
Using checkin-needed, not worth pushing alone and running a full set of test against.