Examine source code of ValueSort

{
  "manifest_version": 3,
  "name": "ValueSort - Supermarket Unit Price Sorter",
  "version": "1.1.4",
  "description": "Sort supermarket search results by unit price to find the best value groceries!",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://www.tesco.com/*",
    "https://groceries.morrisons.com/*",
    "https://www.asda.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.tesco.com/*"
      ],
      "js": [
        "CombinedContentScript.js",
        "TescoContentScript.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://groceries.morrisons.com/*"
      ],
      "js": [
        "CombinedContentScript.js",
        "MorrisonsContentScript.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://www.asda.com/*"
      ],
      "js": [
        "CombinedContentScript.js",
        "AsdaContentScript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "128": "icons/ValueSortLogo.png"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "128": "icons/ValueSortLogo.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "store-priceperunit@dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}