Examine source code of Calendar Anonymizer

{
  "manifest_version": 2,
  "name": "Calendar Anonymizer",
  "description": "Instantly anonymize your google calendar so you can take a screenshot and share your availability with anyone.",
  "author": "Brandon Reid – brandonreid.me",
  "version": "1.1",
  "permissions": [
    "tabs",
    "https://calendar.google.com/",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Anonymize Google Calendar",
    "default_icon": {
      "16": "/images/icon_16.png",
      "32": "/images/icon_32.png",
      "38": "/images/icon_38.png",
      "48": "/images/icon_48.png",
      "128": "/images/icon_128.png"
    }
  },
  "icons": {
    "16": "/images/icon_16.png",
    "32": "/images/icon_32.png",
    "38": "/images/icon_38.png",
    "48": "/images/icon_48.png",
    "96": "/images/icon_96.png",
    "128": "/images/icon_128.png"
  }
}