Examine source code of Pet Policy Extension

{
  "name": "Pet Policy Extension",
  "description": "Get animals data for the resident by email or phone number",
  "version": "1.0",
  "manifest_version": 3,
  "action": {
    "default_popup": "index.html",
    "default_title": "Open the popup"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "./static/js/content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "16": "logo16.png",
    "32": "logo32.png",
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "petpolicyextension@example.org",
      "strict_min_version": "42.0",
      "strict_max_version": "50.*"
    },
    "safari": {
      "strict_min_version": "14",
      "strict_max_version": "20"
    }
  }
}