Examine source code of Simply Shopping List

{
  "name": "Simply Shopping List",
  "description": "Forget about handwriting your shopping list on pieces of paper. Forget about sending text messages with items to be bought.",
  "version": "1.1.1resigned1",
  "manifest_version": 2,
  "icons": {
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e49e5460-1d11-4b37-b838-5ecff21498c3}"
    }
  }
}