This userscript exposes html5 video controls for Instagram videos. It also adds a few youtube-like keyboard shortcuts, and it adds persistent unmute (since Instagram is pretty militant about this for some reason).

This script is based on a user script by FXZFun, see thread here:https://old.reddit.com/r/userscripts/comments/11j8jcc/instagram_video_controls_userscript/

I've iterated on that original to hopefully make it a little better.