Examine source code of Source Inserter

{
  "manifest_version": 2,
  "name": "Source Inserter",
  "version": "1.0",
  "description": "Add and manage sources for citation",
  "permissions": [
    "activeTab",
    "storage",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ccbd4f10-ba1e-46dd-96ea-214a66ca74ea}"
    }
  }
}