add explicit id to allow sideloading

manifest.json

@@ -13,5 +13,11 @@
   },
   "browser_action": {
     "default_title": ".env"
+  },
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "dotenv.scraper@ytrizja.de",
+      "strict_min_version": "80.0"
+    }
   }
 }