Examine source code of SmartMarks

{
  "description": "Smart bookmarks! They follow along when you read.",
  "manifest_version": 2,
  "name": "SmartMarks",
  "version": "1.0.10resigned1",
  "icons": {
    "64": "icons/icon-64.png"
  },
  "applications": {
    "gecko": {
      "id": "smartmarks@smartmarks.com"
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png"
    },
    "default_title": "SmartMarks",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "<all_urls>"
  ]
}