Examine source code of Healthatize

{
  "manifest_version": 3,
  "name": "Healthatize",
  "version": "1.0.1",
  "description": "Decode your food, empower your health.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "page": "background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "healthatize@gmail.com"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}