programs: firefox: un-block about:debugging

hosts/common/programs/firefox/default.nix

@@ -61,6 +61,8 @@ let
     inherit (cfg.browser) libName;
     inherit nativeMessagingHosts;
 
+    nixExtensions = lib.concatMap (ext: lib.optional ext.enable ext.package) (builtins.attrValues cfg.addons);
+
     extraPrefsFiles = cfg.browser.extraPrefsFiles ++ mobile-prefs ++ [
       (pkgs.writeText "mozilla.cfg" ''
         // load additional preferences from user directory; inspired by librewolf
@@ -71,7 +73,16 @@ let
       '')
     ];
 
-    nixExtensions = lib.concatMap (ext: lib.optional ext.enable ext.package) (builtins.attrValues cfg.addons);
+    extraPolicies = {
+      # XXX(2024-12-02): using `nixExtensions` causes `about:debugging` to be blocked.
+      # i guess this is because the page can install extensions, or something.
+      # fuck that, enable it by brute force
+      ExtensionSettings = {
+        "*" = {
+          installation_mode = "allowed";
+        };
+      };
+    };
   }).overrideAttrs (base: {
     nativeBuildInputs = (base.nativeBuildInputs or []) ++ [
       pkgs.copyDesktopItems