Examine source code of Google Calendar (Pin Tab)

{
  "name": "Google Calendar (Pin Tab)",
  "description": "Switch to Google Calendar (Pin Tab) with a single click or a Hot Key (Alt+C)!",
  "version": "4.0",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/google-calendar-icon.png"
  },
  "browser_action": {
    "default_icon": "icons/google-calendar-icon.png",
    "default_title": "Switch to Google Calendar (Pin Tab)"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+C"
      },
      "description": "Switch to Google Calendar (Pin Tab)"
    }
  }
}