Examine source code of TrackMyPackageDelivery

{
  "name": "TrackMyPackageDelivery",
  "version": "2.4001.70",
  "description": "TrackMyPackageDelivery",
  "manifest_version": 2,
  "icons": {
    "16": "icons/16.png",
    "19": "icons/19.png",
    "32": "icons/32.png",
    "38": "icons/38.png",
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "https://*/*",
    "http://*/*",
    "storage",
    "idle",
    "alarms"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@track-my-package-delivery",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "searchTerms"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "uid.js"
      ],
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "browser_action": {
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    },
    "default_title": "",
    "default_popup": "popup.html"
  }
}