Examine source code of BigBlueButton-Custom

{
  "description": "Change the Background of BBB",
  "manifest_version": 2,
  "name": "BigBlueButton-Custom",
  "version": "1.1",
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icons/background.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "borderify.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  }
}