this post was submitted on 07 Jun 2026
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Vivaldi still supports Manifest V2, doesn't it? So you should be able to put UBO on it as well.
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.
Unfortunately, no. Vivaldi followed in Chrome’s footsteps some time ago and disabled MV2 extensions. As far as I know, the only Chromium-based browsers that still have some access to MV2 are Edge, Brave, and Opera. Although there have been recent rumors that Opera also plans to follow suit and end support for MV2.
It seems that, over time, continuing to support MV2 on their own and against the grain of Chromium's main development has become too much of a burden, and they're gradually phasing it out anyway.