While I’m not 100% sure about UBO, I’ve been happily running Ad-Nauseam (based on UBO) on Vivaldi since the Manifest V2 troubles. It does require jumping through a minor hoop, but if you’re tech savvy enough to use adblock, it won’t present you any trouble or take much time at all.
Vivaldi still supports Manifest V2, doesn’t it? So you should be able to put UBO on it as well.
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While I’m not 100% sure about UBO, I’ve been happily running Ad-Nauseam (based on UBO) on Vivaldi since the Manifest V2 troubles. It does require jumping through a minor hoop, but if you’re tech savvy enough to use adblock, it won’t present you any trouble or take much time at all.