Examine source code of Ringover | Click2Call

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "short_name": "Click2Call",
  "author": "Ringover Group",
  "description": "__MSG_appDesc__",
  "homepage_url": "https://ringover.com",
  "default_locale": "en",
  "version": "1.5.19",
  "permissions": [
    "management",
    "contextMenus",
    "tabs",
    "activeTab",
    "webNavigation",
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "action": {
    "default_title": "Click2Call",
    "default_icon": "assets/img/logo-64-disabled.png"
  },
  "background": {
    "page": "index.html"
  },
  "icons": {
    "16": "assets/img/logo-16.png",
    "32": "assets/img/logo-32.png",
    "48": "assets/img/logo-64.png",
    "64": "assets/img/logo-64.png",
    "128": "assets/img/logo-128.png"
  },
  "options_page": "assets/options.html",
  "options_ui": {
    "page": "assets/options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "js": [
        "assets/js/vendors/libphonenumber-max.min.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": true
    },
    {
      "js": [
        "assets/js/content.js",
        "assets/js/main.js",
        "assets/js/crm_modules.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{69f8128d-6275-4768-826a-ef9b9a12af22}"
    }
  }
}