Examine source code of Randoplan extension

{
  "manifest_version": 2,
  "name": "Randoplan extension",
  "version": "1.4",
  "description": "Brings up randoplan.com with the route on the current page loaded.",
  "icons": {
    "48": "android-icon-48x48.png",
    "96": "favicon-96x96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "page_action": {
    "default_title": "Open the route in the current page in randoplan",
    "show_matches": [
      "https://ridewithgps.com/routes/*",
      "https://www.strava.com/routes/*"
    ],
    "default_icon": {
      "19": "icon_19.png",
      "38": "icon_38.png"
    }
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.randoplan.com/*",
        "*://localhost/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c93368a-85da-4e7f-9ec0-586ca4d7d1ec}"
    }
  }
}