Examine source code of Screenshot Auto-Saver

{
  "manifest_version": 2,
  "name": "Screenshot Auto-Saver",
  "version": "1.0",
  "description": "Automatically save game screenshots.",
  "permissions": [
    "activeTab",
    "downloads"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Save Screenshot",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{85799dd4-10d6-40ef-8030-092cd431f46d}"
    }
  }
}