Examine source code of Floor tile calculator

{
  "name": "__MSG_appName__",
  "version": "1.5.4resigned1",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "short_name": "Floor tile calculator",
  "author": "Lorina Tsivinirana",
  "browser_action": {
    "default_title": "__MSG_appAction__",
    "default_popup": "popup.html",
    "default_icon": "icons/icon16.png"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{d2541917-2596-46e0-ba71-2caacecddf06}"
    }
  }
}