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Creating Video chapters for HTML5

I’m absolutely new and not a coder. I’m working my way through tutorials and looking at plugins and such but what I want to do is create an extension like this:

…for starters.

and before you say I can’t, I’ve found a process for converting websites to extensions so I’d just like to know where to start: tutorials or the manual. Just how to get started on this idea.

I don’t want to create a player or import videos into a page, I just want to get the playhead position on the Youtube site and create a timestamp - as per the extension linked above.