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For anyone else annoyed by the xdg-open prompt caused by @Vivaldi on Linux, I replied at https://forum.vivaldi.net/post/779497 about what the cause is (Speed Dial using a custom `vivaldi` protocol for the URL).

And this is when I wished being sponsor of the project got me priority bug fixes or at least raised the visibility of this as it's unfortunate I have to leave Speed Dial off because of this bug.