Youtube layout width issue!

  • hey guys

    I have benn sitting here for HOURS now trying to figure out how I got this to work in firefox but no vivaldi

    see the top browser in my picture is firefox, notice the width difference between it and the bottom browser (Vivaldi)
    I have been googling settings, scripts for tampermonkey, userstyles and official chrome addons.

    How did i get it the way i want in firefox and what have i missed in vivaldi?

    alt text

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