[fulafel]

https://bugzilla.mozilla.org/show_bug.cgi?id=751082 -> https://bugzilla.mozilla.org/show_bug.cgi?id=594876 & https://bugzilla.mozilla.org/show_bug.cgi?id=942302

The issue seems to be in some kind of limbo, with many users reporting that the compositing mode doesn't even make a difference.