[diacritical]

For most videos the speaker talks in a relatively constant speed throughout the video. I've been using Video Speed Controller on Firefox for years. Sadly, it's not actively monitored by Mozilla for security issues even though it has 100k+ downloads. It basically lets you change the speed by whatever increments you want with a key. If the speaker slows down, tap-tap-tap, you can speed it up. I don't really see the need for algorithms or AI to solve what's already almost-solved.

I don't get why this addon isn't included in Firefox to begin with. Maybe because it doesn't just work only on standard HTML5 video files, but has support for specific sites and their players, too? But I've seen several updates on Firefox (not about the addon) that are along the lines of "solved perf issues on $site". So it's not like Firefox is trying to be site-agnostic.