Partially restored header logic, added suggestions for properties

manifest.json

@@ -26,6 +26,14 @@
             "css": [
                 "src/styles/content/listing.scss"
             ]
+        },
+        {
+            "matches": [
+                "*://*.furbooru.org/*"
+            ],
+            "js": [
+                "src/content/header.js"
+            ]
         }
     ],
     "action": {