Vivaldi installer crashes with new MacOS beta...
Just a heads-up that you will not be able to install Vivaldi if you upgrade to the 10.12.4 beta, it crashes Finder if you attempt to start the install app. Hopefully Vivaldi will address this soon, until then Mac uses won't be able to use it.
I would be careful complaining about macOS beta versions. They sometimes can be buggy and sometimes don't always support programs well.