Examine source code of Strava auto kudo

{
  "name": "Strava auto kudo",
  "version": "2.0.0",
  "icons": {
    "16": "medias/16.png",
    "48": "medias/48.png",
    "128": "medias/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.strava.com/*",
        "http://www.strava.com/*"
      ],
      "js": [
        "build/app.js"
      ]
    }
  ],
  "description": "Allows to automatically send kudos on Strava just by pressing the \"k\" key",
  "manifest_version": 2
}