Add YouTube as search engine to Firefox

Also remove the order as I don't care.

home/programs/firefox.nix

@@ -25,11 +25,6 @@ in {
       search = {
         default = "DuckDuckGo";
         order = [
-          "DuckDuckGo"
-          "PHP.net"
-          "MDN (developer.mozilla.org)"
-          "Nix Packages"
-          "Packagist"
         ];
         engines = {
           "PHP.net" = {
@@ -90,6 +85,17 @@ in {
             icon = ./../../assets/packagist.png;
             definedAliases = [ "@packagist" ];
           };
+          "YouTube" = {
+            urls = [{
+              template = "https://www.youtube.com/results";
+              params = [
+                { name = "search_query"; value = "{searchTerms}"; }
+              ];
+            }];
+
+            icon = ./../../assets/youtube.png;
+            definedAliases = [ "@youtube" ];
+          };
 
           "Bing".metaData.hidden = true;
           "Google".metaData.hidden = true;