Examine source code of Mercia's Quill

{
  "manifest_version": 2,
  "name": "Mercia's Quill",
  "description": "Mercia's Quill is a versatile utility app for Sea of Thieves! This extension fetches your access cookies for verification.",
  "version": "0.0.1.6",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage",
    "cookies",
    "*://*.seaofthieves.com/",
    "*://*.merciasquill.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Mercia's Quill",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.seaofthieves.com/*"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2c5ab5b-cc82-4494-87fc-abba5d73a607}"
    }
  }
}