## DoH
Note regarding Trusted Recursive Resolver aka DNS-over-HTTPS (DoH):
Due to privacy concerns (encrypting DNS might be a good thing, sending all DNS 
traffic to Cloudflare by default is not a good idea and applications should 
respect OS configured settings), "network.trr.mode" was set to 5 ("Off by 
choice") by default.
You can enable DNS-over-HTTPS in Firefox's preferences.


## Normandy
Upstream operates a service named Normandy which allows Mozilla to push changes 
for default settings or even install new add-ons remotely. While this can be 
useful to address problems like 'Armagadd-on 2.0' or revert previous decisions 
to disable TLS 1.0/1.1, privacy and security concerns prevail, which is why we 
have switched off the use of this service by default.

To re-enable this service set the following in "about:config":
  app.normandy.enabled=true


## Firefox >100 compatibility
Unfortunately Firefox-100.0 breaks compatibility with some sites using 
useragent checks. To temporarily fix this, enter about:config and modify 
network.http.useragent.forceVersion preference to "99" Or install an addon to 
change your useragent. 
See: https://support.mozilla.org/en-US/kb/difficulties-opening-or-using-website-firefox-100