Examine source code of Screenshot Editor

{
  "manifest_version": 2,
  "name": "Screenshot Editor",
  "version": "1.0",
  "description": "Takes screenshots of webpages and allows users to edit them directly in the browser.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Take Screenshot"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2be0c1b-23b6-4973-ad14-2db9ccd21987}"
    }
  }
}