Before updating you might want to make a backup of your Mozilla profile. I didn’t really like the new version and went back to 68.11. I will wait a while before trying again.
One issue I had was that DoH seemed enabled, or at least my hosts file was not working anymore. It was not available as an option inside the settings page, and ‘about:config’ didn’t work yet. Easiest was to just go back and wait it out.
Holy goodness, it seems that i miss a complete development step. Ok, thanks for the feedback.
For the sake of complettness: Here the location for a direct download without 3rd party apps/packagers: