Created attachment 612853 [details] [diff] [review] patch We do this for certain Document and Windows already, but if we can detect in CanSkip that the object is black, we should do the same thing.
(Btw, this does not fix https://bugzilla.mozilla.org/show_bug.cgi?id=743178 )
Comment on attachment 612853 [details] [diff] [review] patch Is there any problem with calling this in every CC slice? I guess there probably aren't more than a few dozen listeners per document?
There are usually less than 10 listeners per document or window.