Examine source code of Standard Deviation Calc

{
  "name": "Standard Deviation Calculator",
  "description": "Enter the comma separated values in the box to find standard deviation using standard deviation calculator.",
  "version": "1.0.0",
  "manifest_version": 2,
  "browser_action": {
    "default_title": "Standard Deviation Calculator",
    "default_popup": "index.html",
    "default_icon": {
      "16": "assets/16x16.png"
    }
  },
  "icons": {
    "48": "assets/48x48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f0c430a0-6010-4996-881a-7d72bc7d6102}"
    }
  }
}