Omg is working!:

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Put "about:config" into the browser in the search field enter: "browser.tabs.remote.autostart" and set its value to False. Restart the browser. It worked for me, if someone struggles with the same...

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Total noob here, installed Kali on old laptop just because is cool and wanted to test if youtube is working. it was crashing :(

And above post just solved problem.

Thanks!