Examine source code of TKR Screenshot Extension

{
  "name": "TKR Screenshot Extension",
  "version": "1.9",
  "description": "Demonstrate screenshot functionality in the chrome.tabs api.",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "tkr.png",
    "default_title": "Take a screen shot!"
  },
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "16": "16.png",
    "32": "tkr.png",
    "48": "48.png",
    "128": "128 tkr.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{b9777702-1bf5-4f6d-bd69-7a60409c093b}"
    }
  }
}