I don't use that type of addon so I'm no expert, but Giorgio (the NoScript dev and our forum Admin) maintains
FlashGot, will that work for you?
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BTW, Ant Video Downloader is just one where I remembered the link where I had read about it, there are others on that list that also really caught my attention:
- I am not sure what Pin It button is but it's not on AMO... I assume it's pinterest-related, if so it's probably tracking you in all sorts of ways - all these social networks track as much as they can about anyone who access their servers (user or not), and bear in mind that an extension can track you a LOT more than a web page (and do much more damage as well). So unless it's an extension you created or modified, I would strongly suggest you get rid of it.
- I also can remember having recently seen some spam promoting Whatsapp FWIW...
(These aren't all the addons on that list that caught my attention, but on thinking about it more (and disassembling one XPI) the addons I didn't mention
are *not* malicious, but just have similar names to addons that are adware.)