Examine source code of Spoke Package Tracker

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "0.1.0",
  "short_name": "Package Tracker",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "homepage_url": "https://spokepackagetracker.com",
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "omnibox": {
    "keyword": "track"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@spokepackagetracker.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Spoke Package Tracker",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.dhl.com/*tracking*",
        "*://*.fedex.com/Tracking*",
        "*://*.fedex.com/apps/fedextrack/*",
        "*://*.fedex.com/fedextrack/*",
        "*://*.fedex.com/wtrk/track/*",
        "*://*.royalmail.com/portal/rm/track*",
        "*://*.royalmail.com/track-your-item*",
        "*://*.ups.com/WebTracking/*",
        "*://*.ups.com/mobile/track*",
        "*://*.ups.com/track*",
        "*://auspost.com.au/mypost/*",
        "*://auspost.com.au/parcels-mail/*",
        "*://auspost.com.au/track/*",
        "*://business.poste.it/*/cerca/*",
        "*://ecommerceportal.dhl.com/*",
        "*://m.usps.com/m/TrackConfirmAction*",
        "*://mydhl.express.dhl/*",
        "*://ryml.me/*",
        "*://tools.usps.com/go/TrackConfirmAction*",
        "*://tools.usps.com/tracking/*",
        "*://webtrack.dhlecs.com/*",
        "*://webtrack.dhlglobalmail.com/*",
        "*://www.canadapost-postescanada.ca/track-reperage/*",
        "*://www.canadapost-postescanada.ca/trackweb/*",
        "*://www.canadapost.ca/cpotools/*",
        "*://www.canadapost.ca/track-reperage/*",
        "*://www.poste.it/cerca/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/carrier-detect.js"
      ]
    },
    {
      "matches": [
        "*://spokepackagetracker.com/*",
        "*://www.spokepackagetracker.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/spoke-sync.js"
      ]
    }
  ]
}