Examine source code of Magic Date Helper

{
  "manifest_version": 2,
  "name": "Magic Date Helper",
  "short_name": "Magic Date Helper",
  "description": "A magic extension helper for displaying and converting dates",
  "version": "1.1.2resigned1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f43c58fc-74ea-4422-8339-5632d0969b70}"
    }
  }
}