Add pref image.downscale-during-decode.enabled from http://hg.mozilla.org/mozilla-central/rev/d77230596cb5
Add pref image.downscale-during-decode.enabled from http://hg.mozilla.org/mozilla-central/rev/d77230596cb5

nth10sd/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz