Examine source code of Twitch Enhanced Tools

{
  "manifest_version": 2,
  "name": "Twitch Enhanced Tools",
  "version": "2.2",
  "description": "Navigate back in time on Twitch, preview games, and find them on Steam.",
  "permissions": [
    "storage",
    "activeTab",
    "https://api.twitch.tv/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "Pictures/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "Pictures/*.png",
    "Pictures/*.svg"
  ],
  "icons": {
    "48": "Pictures/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4a146e70-3f26-44a4-a467-86538565214a}"
    }
  }
}