It work great in main youtube page
but this extension brake all of youtube embed iframe.
They return error 153.

Would be better if I could just set to maximum resolution available rather than a specific one.

Works as intended but why mock the users with those emojis for 360p & below? (giggling, raised eyebrow & crying, as the screnshot shows)

As reported by https://webcache.googleusercontent.com/search?client=firefox-b-d&q=cache%3Ahttps%3A%2F%2Ftheshiftproject.org%2Fen%2Farticle%2Funsustainable-use-online-video%2F, video streaming is a significant driver of the Internet's electricity consumption and users who pick the minimum useful resolution (e.g. 360p is fine lectures that don't show small-print text, 144p is fine for speeches or music) could find this plugin useful to make a low-res their default.

Therefore, please consider changing the emojis. Maybe to something nature-related, like 🌱, 🌳 & 🌍🌏🌎?