Examine source code of Undo Popups

{
  "name": "Undo Popups",
  "author": "Terry Yuen",
  "version": "0.1.2resigned1",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "19": "icon_19.png",
    "38": "icon_38.png",
    "48": "icon_48.png",
    "96": "icon_96.png"
  },
  "permissions": [
    "webNavigation",
    "tabs"
  ],
  "page_action": {
    "default_icon": {
      "19": "icon_19.png",
      "38": "icon_38.png"
    },
    "default_title": ""
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16049de1-e934-4f6d-a6b0-13b485345f27}"
    }
  }
}