Examine source code of twitchclaim

{
  "manifest_version": 2,
  "name": "twitchclaim",
  "version": "1.0",
  "description": "Twitch bonus claimer",
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.twitch.tv/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff37555d-13c9-4ca1-b04e-9d17312fb6c0}"
    }
  }
}