Examine source code of wordle sync

{
  "description": "keep track of your wordle progress across all devices",
  "manifest_version": 2,
  "name": "wordle sync",
  "version": "1.0",
  "homepage_url": "https://wordlesync.com/",
  "icons": {
    "48": "icons/ws-48.png"
  },
  "permissions": [
    "storage",
    "https://*.powerlanguage.co.uk/*",
    "https://*.nytimes.com/games/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.powerlanguage.co.uk/*",
        "https://*.nytimes.com/games/*"
      ],
      "js": [
        "content_scripts/storage_collector.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@wordlesync.com"
    }
  },
  "browser_action": {
    "default_icon": "icons/wordle-sync.png",
    "default_title": "wordle sync",
    "default_popup": "popup/toolbox.html"
  }
}