Examine source code of Amazon Sort By Arrival

{
  "manifest_version": 2,
  "name": "Amazon Sort By Arrival",
  "version": "1.0",
  "author": "Alex Gulikers",
  "homepage_url": "https://github.com/7MinutesDead-Git/amazon-order-sort",
  "description": "Extracts and sorts orders based on estimated arrival, rather than based on when you placed the order.",
  "icons": {
    "48": "icons/sort-48.png",
    "96": "icons/sort-96.png"
  },
  "permissions": [
    "tabs",
    "scripting"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.com/*"
      ],
      "js": [
        "amazon-order-sort.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "7MD-Amazon-Arrival-Sort@example.com",
      "strict_min_version": "109.0"
    }
  }
}