Examine source code of Offline Screenshot Saver

{
  "manifest_version": 2,
  "name": "Offline Screenshot Saver",
  "version": "1.0",
  "description": "Capture and save website screenshots even when offline.",
  "permissions": [
    "storage",
    "activeTab",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Offline Screenshot Saver",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2b13f86-e546-4003-a2e9-a54b4cfa52fd}"
    }
  }
}