Examine source code of Twitch Viewer Sort

{
  "manifest_version": 2,
  "name": "Twitch Viewer Sort",
  "version": "1.2",
  "description": "Customizable sorting for Twitch streams",
  "permissions": [
    "https://www.twitch.tv/*",
    "webNavigation",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon48.png"
    }
  },
  "icons": {
    "48": "icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c347d077-dd3f-4357-97a5-7e000103c729}"
    }
  }
}