Examine source code of Chat Color Restorer

{
  "manifest_version": 2,
  "name": "Chat Color Restorer",
  "version": "0.1.1",
  "description": "Restores the colored /me messages in Twitch chat, matching the color of the user's username for better chat visibility",
  "content_scripts": [
    {
      "js": [
        "script.js"
      ],
      "matches": [
        "https://*.twitch.tv/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c612e9fd-2a2a-45f6-afd7-7f585f6fc491}"
    }
  }
}