Examine source code of RKS-JS-Injector

{
  "manifest_version": 2,
  "name": "Kishan raval -JavaScript Injector",
  "version": "1.0",
  "description": "Inject JavaScript code into specific websites.",
  "icons": {
    "48": "assets/icon.png"
  },
  "permissions": [
    "activeTab",
    "webNavigation",
    "storage"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "48": "assets/icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ce6bc74-d398-4b18-83b7-da6a3956c7e9}"
    }
  }
}