Examine source code of Streamer Rankings

{
  "manifest_version": 2,
  "name": "Streamer Rankings",
  "version": "1.0.1",
  "description": "This extension adds indicators next to each streamer's name on Twitch, the livestreaming platform. The indicator represents the streamer's ranking in terms of revenue made from the site over the last two years. Firefox port of Ottomated's Otto Numbers",
  "content_scripts": [
    {
      "matches": [
        "https://*.twitch.tv/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}