Examine source code of SendURL via KDEConnect

{
  "description": "Allows url sharing via KDEConnect",
  "manifest_version": 2,
  "name": "SendURL via KDEConnect",
  "version": "1.1",
  "icons": {
    "24": "./images/icon.svg"
  },
  "applications": {
    "gecko": {
      "id": "sendurl@drtiny.gitlab.com",
      "strict_min_version": "54.0"
    }
  },
  "background": {
    "scripts": [
      "./js/connection.js",
      "./js/background.js"
    ]
  },
  "page_action": {
    "browser_style": true,
    "default_title": "SendURL via KDEConnect",
    "default_icon": "./images/icon.svg",
    "default_popup": "popup.html",
    "show_matches": [
      "<all_urls>"
    ],
    "hide_matches": [
      "file:///*"
    ]
  },
  "permissions": [
    "tabs",
    "activeTab",
    "nativeMessaging"
  ]
}