https://vivaldi.com/blog/googles-new-dangerous-web-environme...
It uses Microsoft Edge while installing to open links - like the link to their privacy policy - while the OS is set to use Firefox (and every other app use this). Then I found out that it has zero containerization features at all. Don't want Google cookies from one tab read in another tab? Use a new Private Window. No thanks. Uninstall, and then it used Edge to open a page asking why...