Youtube-SpeedWatch

Browser extension that shows the duration of a video on YouTube based on the playback speed.

Addon available at:

Firefox: https://addons.mozilla.org/en-US/firefox/addon/youtube-speedwatch/
Chrome: https://chromewebstore.google.com/detail/youtube-speedwatch/fcefkpniflbaghkiodhhcfhfdagkmpcm
Releases: https://github.com/GrzegorzWalewski/FoodNetwork-Ad-Skipper/releases (for both browsers)

Only diffrence between these two is manifest_version - for Firefox it's 2 and Chrome use 3