Downloading from YouTube This one is a gem. Ever wanted to download a YouTube video to watch later? No need to purchase third party applications or plugins, this feature comes built right into Safari. Start the video in Safari and hit ⌘+Opt-a to bring up the activity window. Then simply find the largest file (usually multiple MB) and double click it. It’s as easy as that! This trick usually results in an .flv video file. If you want an .mp4, try appending your YouTube url with &fmt=18 or &fmt=22 to get an HD mp4.
