Examine source code of TCGPlayer Seller Aggregation

{
  "manifest_version": 2,
  "name": "TCGPlayer Seller Aggregation",
  "version": "2.1",
  "description": "Identifies the fewest (non-direct) sellers needed to purchase all cards",
  "homepage_url": "https://github.com/Voldrix/TCGPsellerAgg",
  "icons": {
    "32": "icons/TCGPsellerAgg32.png",
    "48": "icons/TCGPsellerAgg48.png",
    "96": "icons/TCGPsellerAgg96.png",
    "240": "icons/TCGPsellerAgg240.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.tcgplayer.com/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true,
    "type": "module"
  },
  "permissions": [
    "cookies",
    "webRequest",
    "https://www.tcgplayer.com/*",
    "https://mp-search-api.tcgplayer.com/*",
    "https://mpgateway.tcgplayer.com/*"
  ],
  "browser_action": {
    "default_icon": "icons/TCGPsellerAgg32.png",
    "default_title": "TCGPlayer Seller Aggregation",
    "default_popup": "popup.html"
  },
  "developer": {
    "name": "Ben Goriesky",
    "url": "https://voldrixia.com/"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c098831-5bb3-4532-89d7-8703fdc33e7e}"
    }
  }
}