Examine source code of x-front-bar

{
  "manifest_version": 2,
  "name": "x-front-bar",
  "version": "1.1resigned1",
  "homepage_url": "https://github.com/mpizza/x-front-bar",
  "description": "Adds fashion bar in top of webpage, let your experience consist of lPhoneX",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "app.js"
      ],
      "css": [
        "app.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec6a4848-50d4-4527-b386-c2a740ddfa03}"
    }
  }
}