Examine source code of Showdown Extra Buttons

{
  "manifest_version": 2,
  "name": "Showdown Extra Buttons",
  "version": "1.2",
  "description": "Adds buttons to pokemon-showdown to show your cloud uploaded teams and some sample teams",
  "icons": {
    "16": "icons/PSicon16.png",
    "32": "icons/PSicon32.png",
    "48": "icons/PSicon48.png",
    "256": "icons/PSicon256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://play.pokemonshowdown.com/*",
        "*://play.radicalred.net/*",
        "*://petmodsdh.com/*",
        "*://*.psim.us/*"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{af6cc9ad-f0a5-44d9-97f0-8472e0ca35ff}"
    }
  }
}