Examine source code of Price Tracker

{
  "manifest_version": 2,
  "name": "Price Tracker",
  "version": "1.0",
  "description": "Track prices of viewed products on shopping websites.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.shopee.vn/*",
        "*://*.tiki.vn/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e39dfc7a-4141-4f15-b0f8-620e6c081d18}"
    }
  }
}