It annoys me because I really want to use it. I'm very happy that we have it and I hope that the wider community will hold Mozilla to account every time they try something shady to protect the best free and open browser we have. If we lose Firefox, we lose the Internet to corporations.
It works well on windows, I don't know how far the mac support is.
WebRender does work on macOS (and Android and maybe Linux), but Mozilla is prioritizing a Windows MVP first (because something like 90% of Firefox users are on Windows). Work on macOS, Linux, and Android will then resume.
1: https://support.mozilla.org/en-US/kb/profile-manager-create-...
Yet how long will we have it if everyone keeps using excuses to continue using Chrome?
Firefox on Mac is noticeably slower.