Honestly, while I appreciate the Mullvad initiative, as a Mullvad VPN customer, their choices still primarily serve up thinly disguised advertising as the top search responses, compared to my own self hosted SearXNG results: https://github.com/searxng/searxng

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What browser are you using and can you please post a site with embedding that does not work for you.

I have Librewolf, Ublock set to medium mode, libredirect Redirect Type set to both, Embed Frontend set to Invidious but with no instance selected.

Most sites with embedded youtube have ‘Watch on Youtube’ bottom left and you can just right click and select Redirect in librediract. Some don’t have that but most allow right click where you can select the url that can be pasted into FreeTube.

You can set libredirect to use FreeTube.