Examine source code of VAST

{
  "manifest_version": 2,
  "version": "0.0.4",
  "name": "VAST - Keeping EA's Organized",
  "description": "VAST browser extension for Google Calendar and Outlook",
  "permissions": [
    "https://calendar.google.com/*",
    "https://outlook.live.com/*"
  ],
  "browser_action": {
    "default_icon": "icon-34.png"
  },
  "icons": {
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://calendar.google.com/*",
        "https://outlook.live.com/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.css",
    "icon-128.png",
    "icon-34.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e18d011-9905-4077-acdd-56cf7d13f403}"
    }
  }
}