Download Youtube Videos in HD! Download Youtube, Megavideo, Dail. Firefox Add-On SkipScreen Spares You Some Ads and Wait Screens - PCWorld. The appropriately named SkipScreen add-on for Firefox aims to brush past the intermediary screens with ads or wait timers used by download sites such as Megaupload.com or zShare.net. But this free add-on may not work for all the advertised sites. In my testing, SkipScreen turned in mixed results. It worked as intended for Rapidshare, one supported download site. NoScript - JavaScript/Java/Flash blocker for a safer Firefox experience! - what is it? - InformAction.