Examine source code of Screenshot Taker

{
  "manifest_version": 2,
  "name": "Screenshot Taker",
  "version": "1.0",
  "description": "Takes a screenshot of the current tab.",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Take Screenshot",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4fedfde0-f764-482e-bb26-1423b8010bad}"
    }
  }
}