Examine source code of VtM Character Sheet

{
  "manifest_version": 2,
  "name": "VtM Character Sheet",
  "version": "1.0",
  "description": "Interactive character sheet for Vampire: The Masquerade",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png"
    },
    "default_title": "Open VtM Character Sheet"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "Damon Wilna",
  "homepage_url": "https://github.com/DamonWilna/VtM-Character-Sheet",
  "browser_specific_settings": {
    "gecko": {
      "id": "vtm-character-sheet@damonwilna.github.io"
    }
  }
}