Flash blocking features including: - Preferring non-Flash fallback content (Bug 1282484) - Blocking based on lists (Bug 1307604) - Click-to-play by default are currently available, but are pref-ed off. Once needed testing and studies are complete, the default preferences should be changed such that Firefox's default behavior is to block Flash using those mechanisms.

I believe that the preference values that will need to be set are: - plugins.flashBlock.enabled = true - plugin.state.flash = 1 - plugins.favorfallback.mode = "follow-ctp" - plugins.favorfallback.rules = "video" These preferences and their values are not final.