Examine source code of WEM Price Compare

{
  "manifest_version": 3,
  "name": "WEM Price Compare",
  "version": "1.8.0",
  "description": "See if a product is cheaper elsewhere. One click on any shop worldwide; automatic on Amazon, eBay and major retailers.",
  "permissions": [
    "storage",
    "alarms",
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "wem-price-compare@wem3.ai",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "host_permissions": [
    "https://www.amazon.co.uk/*",
    "https://www.amazon.com/*",
    "https://www.ebay.co.uk/*",
    "https://www.ebay.com/*",
    "https://cart.ebay.com/*",
    "https://cart.ebay.co.uk/*",
    "https://www.currys.co.uk/*",
    "https://www.argos.co.uk/*",
    "https://www.johnlewis.com/*",
    "https://ao.com/*",
    "https://www.ao.com/*",
    "https://www.very.co.uk/*",
    "https://www.boots.com/*",
    "https://www.asos.com/*",
    "https://www.apple.com/*",
    "https://www.superdrug.com/*",
    "https://www.lookfantastic.com/*",
    "https://www.cultbeauty.co.uk/*",
    "https://www.beautybay.com/*",
    "https://www.spacenk.com/*",
    "https://www.thebodyshop.com/*",
    "https://www.myprotein.com/*",
    "https://www.lego.com/*",
    "https://www.dunelm.com/*",
    "https://www.diy.com/*",
    "https://www.wickes.co.uk/*",
    "https://www.robertdyas.co.uk/*",
    "https://www.wayfair.co.uk/*",
    "https://www.pandora.net/*",
    "https://www.marksandspencer.com/*",
    "https://www.sainsburys.co.uk/*",
    "https://www.debenhams.com/*",
    "https://www.superdry.com/*",
    "https://www.monsoon.co.uk/*",
    "https://www.qvcuk.com/*",
    "https://www.decathlon.co.uk/*",
    "https://www.sweatybetty.com/*",
    "https://www.prettylittlething.com/*",
    "https://www.boohoo.com/*",
    "https://www.clarks.co.uk/*",
    "https://www.schuh.co.uk/*",
    "https://www.jdsports.co.uk/*",
    "https://www.riverisland.com/*",
    "https://www.boden.co.uk/*",
    "https://www.laredoute.co.uk/*",
    "https://www.mango.com/*",
    "https://www.simplybe.co.uk/*",
    "https://superdrug.com/*",
    "https://lookfantastic.com/*",
    "https://cultbeauty.co.uk/*",
    "https://beautybay.com/*",
    "https://spacenk.com/*",
    "https://thebodyshop.com/*",
    "https://myprotein.com/*",
    "https://lego.com/*",
    "https://dunelm.com/*",
    "https://diy.com/*",
    "https://wickes.co.uk/*",
    "https://robertdyas.co.uk/*",
    "https://wayfair.co.uk/*",
    "https://pandora.net/*",
    "https://marksandspencer.com/*",
    "https://sainsburys.co.uk/*",
    "https://debenhams.com/*",
    "https://superdry.com/*",
    "https://monsoon.co.uk/*",
    "https://qvcuk.com/*",
    "https://decathlon.co.uk/*",
    "https://sweatybetty.com/*",
    "https://prettylittlething.com/*",
    "https://boohoo.com/*",
    "https://clarks.co.uk/*",
    "https://schuh.co.uk/*",
    "https://jdsports.co.uk/*",
    "https://riverisland.com/*",
    "https://boden.co.uk/*",
    "https://laredoute.co.uk/*",
    "https://mango.com/*",
    "https://simplybe.co.uk/*",
    "https://wem3.ai/*"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.amazon.co.uk/dp/*",
        "https://www.amazon.co.uk/*/dp/*",
        "https://www.amazon.co.uk/gp/product/*",
        "https://www.amazon.com/dp/*",
        "https://www.amazon.com/*/dp/*",
        "https://www.amazon.com/gp/product/*",
        "https://www.amazon.co.uk/gp/cart/*",
        "https://www.amazon.co.uk/cart/*",
        "https://www.amazon.com/gp/cart/*",
        "https://www.amazon.com/cart/*"
      ],
      "js": [
        "lib/i18n.js",
        "lib/widget.js",
        "lib/basket-widget.js",
        "lib/extract-core.js",
        "site-adapters.js",
        "lib/compare-core.js",
        "lib/basket-core.js",
        "content.js"
      ],
      "css": [
        "styles/widget.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.ebay.co.uk/itm/*",
        "https://www.ebay.com/itm/*",
        "https://www.ebay.co.uk/cart*",
        "https://cart.ebay.co.uk/*",
        "https://www.ebay.com/cart*",
        "https://cart.ebay.com/*"
      ],
      "js": [
        "lib/i18n.js",
        "lib/widget.js",
        "lib/basket-widget.js",
        "lib/extract-core.js",
        "site-adapters.js",
        "lib/compare-core.js",
        "lib/basket-core.js",
        "content.js"
      ],
      "css": [
        "styles/widget.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.currys.co.uk/*",
        "https://www.argos.co.uk/*",
        "https://www.johnlewis.com/*",
        "https://ao.com/*",
        "https://www.ao.com/*",
        "https://www.very.co.uk/*",
        "https://www.boots.com/*",
        "https://www.asos.com/*",
        "https://www.apple.com/*",
        "https://www.superdrug.com/*",
        "https://www.lookfantastic.com/*",
        "https://www.cultbeauty.co.uk/*",
        "https://www.beautybay.com/*",
        "https://www.spacenk.com/*",
        "https://www.thebodyshop.com/*",
        "https://www.myprotein.com/*",
        "https://www.lego.com/*",
        "https://www.dunelm.com/*",
        "https://www.diy.com/*",
        "https://www.wickes.co.uk/*",
        "https://www.robertdyas.co.uk/*",
        "https://www.wayfair.co.uk/*",
        "https://www.pandora.net/*",
        "https://www.marksandspencer.com/*",
        "https://www.sainsburys.co.uk/*",
        "https://www.debenhams.com/*",
        "https://www.superdry.com/*",
        "https://www.monsoon.co.uk/*",
        "https://www.qvcuk.com/*",
        "https://www.decathlon.co.uk/*",
        "https://www.sweatybetty.com/*",
        "https://www.prettylittlething.com/*",
        "https://www.boohoo.com/*",
        "https://www.clarks.co.uk/*",
        "https://www.schuh.co.uk/*",
        "https://www.jdsports.co.uk/*",
        "https://www.riverisland.com/*",
        "https://www.boden.co.uk/*",
        "https://www.laredoute.co.uk/*",
        "https://www.mango.com/*",
        "https://www.simplybe.co.uk/*",
        "https://superdrug.com/*",
        "https://lookfantastic.com/*",
        "https://cultbeauty.co.uk/*",
        "https://beautybay.com/*",
        "https://spacenk.com/*",
        "https://thebodyshop.com/*",
        "https://myprotein.com/*",
        "https://lego.com/*",
        "https://dunelm.com/*",
        "https://diy.com/*",
        "https://wickes.co.uk/*",
        "https://robertdyas.co.uk/*",
        "https://wayfair.co.uk/*",
        "https://pandora.net/*",
        "https://marksandspencer.com/*",
        "https://sainsburys.co.uk/*",
        "https://debenhams.com/*",
        "https://superdry.com/*",
        "https://monsoon.co.uk/*",
        "https://qvcuk.com/*",
        "https://decathlon.co.uk/*",
        "https://sweatybetty.com/*",
        "https://prettylittlething.com/*",
        "https://boohoo.com/*",
        "https://clarks.co.uk/*",
        "https://schuh.co.uk/*",
        "https://jdsports.co.uk/*",
        "https://riverisland.com/*",
        "https://boden.co.uk/*",
        "https://laredoute.co.uk/*",
        "https://mango.com/*",
        "https://simplybe.co.uk/*"
      ],
      "js": [
        "lib/i18n.js",
        "lib/widget.js",
        "lib/basket-widget.js",
        "lib/extract-core.js",
        "site-adapters.js",
        "lib/compare-core.js",
        "lib/basket-core.js",
        "content.js"
      ],
      "css": [
        "styles/widget.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "optional_host_permissions": [
    "*://*/*"
  ],
  "default_locale": "en"
}