Examine source code of FireGather

{
  "manifest_version": 2,
  "name": "FireGather",
  "description": "Looks up MTG cards on Gatherer",
  "homepage_url": "https://github.com/mmcru/firegather",
  "author": "Matt Crupi",
  "version": "1.0.3resigned1",
  "default_locale": "en",
  "background": {
    "scripts": [
      "cards.js",
      "lookup.js"
    ]
  },
  "permissions": [
    "menus"
  ],
  "icons": {
    "64": "icons/64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ba39e01-f173-460f-b75f-6c5a9a5dc313}"
    }
  }
}