Add pref layout.event-regions.enabled from https://bugzilla.mozilla.org/show_bug.cgi?id=1073024 (r=kats)
Add pref layout.event-regions.enabled from https://bugzilla.mozilla.org/show_bug.cgi?id=1073024 (r=kats)

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