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This script not working (Arrow left, right & spacebar) in Firefox Dev Edition with Violentmonkey, can you update this script? Thanks.

Or there any settings for settings that config?

When you enter the youtube mobile version, the video is not played at the beginning.

You need to click it to start.

After it starts, then you can use arrow left right and spacebar to control the video player.

I have tested it with Firefox+Violentmonkey

It doesn’t seem to be working for me, I’m using macOS.

Video

I am using macOS too but not yet be able to reproduce your issue... Try to fix later.