Select a youtube resolution and resize the player.
Looks like youtube made some changes that broke it. I made a change that seems to work for me for now, so please update the script and let me know if that fixes it.
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Love this script. Today (also happened months before, then fixed) the autoTheater stopped working. I only changed these 2 lines:
targetRes: "large",
autoTheater: true,
Using Violentmonkey on Firefox latest.
Thanks.