Does not install into Chrome based Vivaldi Browser

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Vivaldi browser (based on original Opera product) allows me to install chrome extensions. However, when i try to install BrainyAI from the chrome extension store, i get an error "Invalid Manifest". Thanks!

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Maybe it has something to do with manifest v3..

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Tried with chromium as well. Same result.

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I've tried multiple chrome browsers, and they all fail with the same message. Currently I'm using Manjaro linux (arch based).