Examine source code of Co-Browsing

{
  "name": "HelloScreen Screen Sharing",
  "version": "2025.7.6",
  "description": "HelloScreen Co-Browsing for Firefox",
  "manifest_version": 2,
  "author": "helloscreen.com",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Share this tab"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "injection.js",
        "upscope.js",
        "pdf.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "images/icon/not_active_light_16.png",
    "48": "images/icon/not_active_light_48.png",
    "128": "images/icon/not_active_light_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{674569a1-986d-4525-8f48-293407b39d2b}"
    }
  }
}