feat(browsers): search.moonarch.de as default search engine, list trimmed to DuckDuckGo and Wikipedia

modules/browsers.nix

@@ -94,7 +94,35 @@ in
         ImproveSuggest = false;
       };
 
-      SearchEngines.Default = "DuckDuckGo";
+      # The own search instance, added and made the default. Default only sets
+      # where Firefox starts; switching in the search settings keeps working.
+      # No IconURL: the favicon sits behind the Authelia login, so Firefox
+      # could not fetch it when it applies the policy.
+      SearchEngines = {
+        Add = [
+          {
+            Name = "moonarch";
+            URLTemplate = "https://search.moonarch.de/search?q={searchTerms}";
+            Method = "GET";
+            Alias = "@m";
+          }
+        ];
+        Default = "moonarch";
+        # Everything Firefox 157 ships for German locale and region, except
+        # DuckDuckGo and Wikipedia (de). Hidden from the list, not uninstalled;
+        # names as the search settings show them, a typo is silently ignored.
+        Remove = [
+          "Bing"
+          "eBay"
+          "Ecosia"
+          "Google"
+          "LEO Eng-Deu"
+          "Perplexity"
+          "Reddit"
+          "Startpage"
+          "YouTube"
+        ];
+      };
       OfferToSaveLogins = false;
 
       # Startup and the home button both land on a blank page. StartPage