I've used gufw for a while now. Nice and simple as you say. One aspect I did find a little confusing at first is that when you run gufw as root it looks as though the firewall is off (quite gray interface), but when you click the unlock choice/button it springs into more colour and reveals that its actually ON (or if not you can turn it on). Mostly a set and forget thing however (I don't even bother with a panel/tray icon for it).
Add to that a good /etc/hosts file content ... which many pup's have something like a MENU, INTERNET ... last choice (Adblock) function already included to set that up ... and that can be used instead of something like ublock origin or adblock (lightens the load on the browser).
You could get away with just having NoScript as the only addon/extension installed in Firefox and along with the above two ...
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