I use Brieftube to skim through long youtube/coursera videos or to pinpoint to a specific memorable frame in a video I once watched (e.g. obama laughing at bernie at white house gathering).
Brieftube runs fast, and creates a nice table of contents which also allows easy searching in the sub titles
(currently, extension seems to work only for videos accompanied with english subtitles)
(currently, extension seems to work only for videos accompanied with english subtitles)
https://chrome.google.com/webstore/detail/brieftube-instant-...