firefox: block addon manager, update todo

TODO.md

@@ -2,9 +2,8 @@ TODO list sorted by priority:
 * workflow: set up patchouli to have regular and automated backups
 * security: security hardening through sandboxing 
 * security: tor profiles and fix iana
-* workflow: sync music & other with ceph
 * xdg: nixpkgs PR, check if xdg patches actually work
-* locale: sync mozc/ibus settings, saner defaults, make panel work in wayland
+* locale: sync mozc/ibus settings, saner defaults
 * workflow: fix GTK theme
 * workflow: fix re-scaling after swaylock
 * workflow: add smooth transition from plymouth to sway [1]

common/graphical.nix

@@ -120,6 +120,7 @@ let
        EnableTrackingProtection.Value = false;
        DisableFeedbackCommands = true;
        SearchEngines.Default = "DuckDuckGo";
+       BlockAboutAddons = true;
     };
     extraPrefs = '' 
      // make tracking much harder