Just switched to Firefox beta to test this out. Looking good so far!
The other thing that I've been waiting for is better multi-profile support. You can get a (pre-release) version of that now by opting into the Containers experiment: https://testpilot.firefox.com/experiments/containers
The other thing that I've been waiting for is better multi-profile support. You can get a (pre-release) version of that now by opting into the Containers experiment: https://testpilot.firefox.com/experiments/containers