Examine source code of Steambot

{
  "manifest_version": 2,
  "name": "Steambot",
  "version": "0.0.2",
  "applications": {
    "gecko": {
      "id": "steambot@erikgibbons.com"
    }
  },
  "description": "Takes multiple Steam keys as input to add batches of games to your library at a time.",
  "icons": {
    "48": "icons/steambot-48.png",
    "96": "icons/steambot-96.png",
    "128": "icons/steambot-96-128.png"
  },
  "browser_action": {
    "default_icon": "icons/steambot-38.png",
    "default_popup": "options.html"
  },
  "permissions": [
    "tabs",
    "*://*.steampowered.com/account/registerkey*"
  ],
  "options_ui": {
    "page": "options.html"
  }
}