Examine source code of Video Autoplay Blocker

{
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "blocker.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Prevents from autoplay HTML5 video",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "manifest_version": 2,
  "name": "Video Autoplay Blocker",
  "short_name": "Video Autoplay Blocker",
  "version": "1.0"
}