I didn't mean to imply Arkenfox is unstable, it's great. I meant the Arkenfox maintainer is playing whackamole with FF. Every so often FF adds a spying feature (like this one), then Arkenfox has to react and turn it off and cut a release, then everyone has to run the updater script. My system auto updates Firefox, but not Arkenfox. So if I don't want any windows of vulnerability I'm stuck having to pay attention to updates and make sure I run the updater script at just the right time.