Examine source code of PriceCheck shortcut

{
  "manifest_version": 2,
  "name": "PriceCheck shortcut",
  "version": "2.0",
  "description": "An extension for South Africa online shopping pages that generates a shortcut to search for the product on pricecheck.co.za",
  "author": "Eustacia Rajman",
  "homepage_url": "https://github.com/Dafterfly/PriceCheck-shortcut",
  "content_scripts": [
    {
      "matches": [
        "*://*.takealot.com/*",
        "*://*.makro.co.za/*",
        "*://*.bobshop.co.za/*",
        "*://*.woolworths.co.za/*",
        "*://*.superbalist.com/*",
        "*://*.loot.co.za/*",
        "*://*.bidorbuy.co.za/*",
        "*://*.truworths.co.za/*",
        "*://*.pnp.co.za/*",
        "*://*.shoprite.co.za/*",
        "*://*.clicks.co.za/*",
        "*://*.dischem.co.za/*",
        "*://*.game.co.za/*",
        "*://*.hificorp.co.za/*",
        "*://*.yuppiechef.com/*",
        "*://*.fashionnova.com/*",
        "*://*.zando.co.za/*",
        "*://*.cottonon.com/*",
        "*://*.mrp.com/*",
        "*://*.bash.com/*",
        "*://*.edgars.co.za/*",
        "*://*.thebabyshoppe.co.za/*",
        "*://*.toykingdom.co.za/*",
        "*://*.spree.co.za/*",
        "*://*.game.co.za/*",
        "*://*.incredible.co.za/*",
        "*://*.checkers.co.za/*",
        "*://*.builders.co.za/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "fav.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2dcf2e44-5105-420b-9442-07d6194cd43d}"
    }
  }
}