Examine source code of Twitch Stream Filter

{
  "manifest_version": 3,
  "name": "Twitch Stream Filter",
  "version": "1.0",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "twitchstreamfilterextension@hotmail.com"
    }
  }
}