Thought this might be helpful to others who use Mullvad Browser.
Got to the advanced preferences and set webextensions.storage.sync.enabled to true.
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Alternatively, Piped has SponsorBlock built in. It also has DeArrow support, but I find it causes too much of a slowdown so I keep it disabled. Plus, since I only really watch from my subscriptions, clickbait is less of a worry for me.