Examine source code of Compare

{
  "manifest_version": 2,
  "name": "Compare",
  "version": "1.0.0",
  "description": "View two pages side-by-side in the sidebar and main panel. Perfect for diffing docs, comparing products, or reviewing translations.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "sidebar_action": {
    "default_panel": "frame/ui.html",
    "default_title": "Compare — Side-by-Side",
    "default_icon": "icons/comp-split-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "quangtrinh169@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "description": "No data is collected. Pages are loaded at user request; nothing is sent to third parties."
      }
    }
  },
  "background": {
    "scripts": [
      "bridge/background.js"
    ],
    "persistent": false
  }
}