Comment 13 for bug 1151601

My first option is to download a youtube video - so it is not dependent on the internet working.
I find keepvid works fine, there is a script that makes it very simple.
Some youtube videos will not download - I think they are protected.

After getting advice in the forums, I created a formatting tag {yt} This tag has the 2 parts of the youtube embed code in it with the autoplay flag.
All I need to do is create a custom slide with {yt}youtube_id{/yt} and youtube plays on screen.
This is effectively no different to playing youtube in a browser as I am using their own code for embedding in a web page.