Examine source code of Page Modeller

{
  "name": "Page Modeller (Selenium, Robot Framework etc)",
  "short_name": "PageModeller",
  "description": "Browser DevTools extension for modelling web pages for automation.",
  "version": "2.1.0",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon_16_grey.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_action": {
    "default_title": "Page Modeller",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon_16_grey.png",
      "48": "icons/icon_48.png",
      "128": "icons/icon_128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "devtools_page": "devtools-page.html",
  "permissions": [
    "storage",
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "applications": {
    "gecko": {
      "id": "{1e34b9b3-8f45-415e-9586-c7d5de0d0aff}",
      "strict_min_version": "57.0"
    }
  }
}