Examine source code of tetrio-mobile-input

{
  "name": "tetrio-mobile-input",
  "version": "0.0.6",
  "description": "Allow Mobile Users to use input",
  "manifest_version": 2,
  "icons": {
    "16": "assets/images/icon16.png",
    "32": "assets/images/icon32.png"
  },
  "permissions": [
    "*://*.tetr.io/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://tetr.io/*"
      ],
      "include_globs": [
        "https://tetr.io/",
        "https://tetr.io/?*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{57b96254-8ed0-4dd0-8fa7-3dae5f79a99f}"
    }
  }
}