Examine source code of Youtube Context Remover

{
  "manifest_version": 2,
  "name": "Youtube Context Remover",
  "version": "1.0",
  "description": "Removes the Context Box from Youtube Videos",
  "icons": {
    "48": "icons/logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "YCR.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{86f5cba6-0869-4c55-815e-c9b06de2f375}"
    }
  }
}