Examine source code of webTestLab

{
  "manifest_version": 2,
  "name": "webTestLab",
  "version": "19.12.7.9",
  "description": "Sends page to Web Test Lab on uiFlowDesign",
  "icons": {
    "16": "images/atpmt16.png",
    "32": "images/atpmt32.png",
    "48": "images/atpmt48.png",
    "64": "images/atpmt64.png",
    "128": "images/atpmt128.png",
    "256": "images/atpmt256.png",
    "512": "images/icon.png"
  },
  "permissions": [
    "<all_urls>",
    "http://*/*",
    "https://*/*",
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "notifications",
    "cookies"
  ],
  "browser_action": {
    "default_icon": "images/icon.png",
    "default_popup": "toolbarbutton/button.html",
    "default_title": "Send to uiFlowDesign"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "lib/jquery-3.4.1.min.js",
        "lib/jquery-ui.js",
        "lib/jquery-ui.min.js",
        "common/globals.js",
        "common/performance.js",
        "common/HTMLEventParser.compiled.js",
        "common/utils.js",
        "common/rrweb-record.min.js",
        "internals/location.js",
        "internals/messages-content-script.js",
        "internals/block-frame-detection.js",
        "frame-features/highlight.js",
        "frame-features/component-mode.js",
        "frame-features/cookies.js",
        "frame-features/click.js",
        "frame-features/right-click.js",
        "frame-features/double-click.js",
        "frame-features/keypress-event.js",
        "frame-features/forms.js",
        "frame-features/drag-drop.js",
        "frame-features/mousedown.js",
        "frame-features/mouseover.js",
        "frame-features/url-change.js",
        "frame-features/attributes.js",
        "frame-features/screenshot.js",
        "frame-features/script.js",
        "frame-features/rrweb.js",
        "frame-features/recording.js",
        "frame-features/browser-event.js",
        "frame-features/url.js",
        "frame-features/date-picker.js",
        "frame-features/screenshot-cropper.js",
        "frame-features/theme.js",
        "lib/cropper/cropper.min.js",
        "lib/dom-to-image.js",
        "popup/popupHandler.js",
        "popup/popup.js"
      ],
      "css": [
        "lib/cropper/cropper.min.css"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    },
    {
      "matches": [
        "https://*.atpmt.com/*",
        "http://localhost/*"
      ],
      "js": [
        "lib/jquery-3.4.1.min.js",
        "lib/jquery-ui.js",
        "frame-features/screenshot-cropper.js",
        "lib/cropper/cropper.min.js",
        "frame-features/frame-parent.js"
      ],
      "css": [
        "lib/cropper/cropper.min.css",
        "lib/jquery-ui.min.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "frame-features/highlight.css",
    "popup/popup.css",
    "popup/popupHandler.js"
  ],
  "background": {
    "scripts": [
      "common/globals.js",
      "common/performance.js",
      "common/utils.js",
      "internals/location.js",
      "internals/headers-block.js",
      "internals/headers-cookies.js",
      "internals/screenshot-background.js",
      "internals/messages-background-script.js",
      "internals/messages-tab-state.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6f17c801-07f3-4f85-b8b9-eb3ecb167b6c}"
    }
  }
}