Playing youtube videos on firefox has "hickups" since updating

Yesterday I updated Manjaro (for the first time in 2 weeks or something) and now Firefox seems to have a problem playing YouTube videos. Every 30 seconds or so the video just freezes for maybe a 5th of a second. That is really annoying when listening to music. Short after the update there was another Firefox update but it didn’t fix the issue.

Is there anyone else with this issue?

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I have this issue for now: [Testing Update] 2021-04-16 - Kernels, Mesa, Wine, Plasma5, KDE Frameworks, LibreOffice, Bluez - #38 by omano