Examine source code of Unicode Smiley

{
  "manifest_version": 2,
  "name": "Unicode Smiley",
  "version": "0.2.2resigned1",
  "description": "Extension pour afficher les codes Unicode des smileys Unicode.",
  "icons": {
    "16": "icons/Icon-16.png",
    "32": "icons/Icon-32.png",
    "48": "icons/Icon-48.png",
    "96": "icons/Icon-96.png",
    "128": "icons/Icon-128.png",
    "256": "icons/Icon-256.png"
  },
  "browser_action": {
    "default_icon": "icons/Icon-32.png",
    "default_title": "Unicode Smiley",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6930cf7d-584e-46c5-9fd9-aff3d3bd4308}"
    }
  }
}