Examine source code of SyncMarket

{
  "manifest_version": 3,
  "name": "SyncMarket",
  "version": "1.0.1",
  "description": "Track view counts and growth trends for your Gumtree and eBay listings. Automatic history, daily and 7-day deltas, performance scores, and optional cloud sync with Lifetime Pro.",
  "icons": {
    "16": "src/assets/icons/icon_16.png",
    "32": "src/assets/icons/icon_32.png",
    "48": "src/assets/icons/icon_48.png",
    "128": "src/assets/icons/icon_128.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "*://*.gumtree.com/manage*",
    "*://*.ebay.com/sh/*",
    "*://*.ebay.com/mys/*",
    "*://*.ebay.co.uk/sh/*",
    "*://*.ebay.co.uk/mys/*",
    "*://*.ebay.de/sh/*",
    "*://*.ebay.de/mys/*",
    "*://*.ebay.com.au/sh/*",
    "*://*.ebay.com.au/mys/*"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "src/browser-polyfill.js",
      "src/background/gumroadApi.js",
      "src/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "syncmarket@tobydaze",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.gumtree.com/manage*",
        "*://*.ebay.com/sh/*",
        "*://*.ebay.com/mys/*",
        "*://*.ebay.co.uk/sh/*",
        "*://*.ebay.co.uk/mys/*",
        "*://*.ebay.de/sh/*",
        "*://*.ebay.de/mys/*",
        "*://*.ebay.com.au/sh/*",
        "*://*.ebay.com.au/mys/*"
      ],
      "js": [
        "src/browser-polyfill.js",
        "src/shared/numbers.js",
        "src/shared/time.js",
        "src/shared/diagnostics.js",
        "src/storage/indexedDbHistoryStorage.js",
        "src/storage/accountStorage.js",
        "src/storage/chromeHistoryStorage.js",
        "src/storage/historyRepository.js",
        "src/sync/syncTypes.js",
        "src/sync/localSyncExport.js",
        "src/sync/localSyncImport.js",
        "src/sync/syncStatus.js",
        "src/sync/syncSettings.js",
        "src/sync/cloudSyncAdapter.js",
        "src/analytics.js",
        "src/platforms/gumtree.js",
        "src/platforms/ebay.js",
        "src/platforms/index.js",
        "src/content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}