Examine source code of The Grator

{
  "description": "Grator Toolbar Button",
  "manifest_version": 2,
  "name": "Grate it!",
  "version": "1.1resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/grtr-16.png",
      "32": "icons/grtr-32.png"
    }
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{da490bdd-db9f-43de-9485-72502830351e}"
    }
  }
}