Examine source code of The button for Surfly

{
  "manifest_version": 3,
  "name": "The button for Surfly",
  "description": "This extension adds a page action which allows you to convert the current tab to a Surfly session",
  "version": "0.4.1",
  "icons": {
    "64": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e0a17a38-2a65-11ee-b5e7-f02f741aae15}",
      "strict_min_version": "109.0"
    }
  },
  "host_permissions": [
    "https://*.surfly.online/*",
    "https://surfly.online/*",
    "https://*.surfly.com/*",
    "https://surfly.com/*",
    "https://*.webfuse.com/*",
    "https://webfuse.com/*",
    "https://*.webfu.se/*",
    "https://webfu.se/*"
  ],
  "permissions": [
    "tabs",
    "scripting"
  ],
  "page_action": {
    "default_icon": "icons/action.png",
    "default_title": "Surf it!"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}