Examine source code of Absolute Value Calculator

{
  "manifest_version": 2,
  "name": "Absolute Value Calculator",
  "version": "1.0",
  "description": "Calculates the absolute value of a number",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{029c90e3-48f1-4f65-8cb3-3a948f890cca}"
    }
  }
}