Examine source code of NoYtPreview

{
  "manifest_version": 2,
  "name": "NoYtPreview",
  "version": "1.2",
  "description": "Removes the hover preview on YouTube videos on the Home tab",
  "icons": {
    "48": "icons/noytpreview-48.png",
    "96": "icons/noytpreview-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{33c262c6-1b67-4c47-aee4-bf826d075268}"
    }
  }
}