Examine source code of Video Snapshot

{
  "name": "Video Snapshot",
  "version": "0.5.22",
  "manifest_version": 2,
  "description": "Capture a snapshot of video.",
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "permissions": [
    "activeTab",
    "downloads"
  ],
  "background": {
    "scripts": [
      "bext.js",
      "bg.js"
    ]
  },
  "browser_action": {
    "default_icon": "128.png",
    "default_popup": "popup.html"
  }
}