Examine source code of Clickable Phone Numbers

{
  "name": "Clickable Phone Numbers",
  "version": "0.5.3",
  "manifest_version": 2,
  "description": "Scans web pages for telephone numbers and automatically converts them into clickable links, allowing you to dial them instantly with your preferred calling app",
  "permissions": [
    "storage",
    "contextMenus",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*/*"
      ],
      "js": [
        "jquery-3.5.1.min.js",
        "content_script.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "icons": {
    "16": "icon16.png",
    "128": "icon128.png"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7b3d82f7-696c-47be-ba5e-8f2b9dafb00d}"
    }
  }
}