Hey guys, check out this cool extension!
https://addons.mozilla.org/en-US/firefox/addon/take-youtube-video-screenshotsIt allows you to take handy screenshot of a stream through press of a button!
It even has extensive customization options with things like where the screenshots go to how they are named!
Personally I recommend putting TIME3 in your filename options since streams usually go for over a hour and the hour isn't included by default which can mess up your ordering if you are watching a concert!
