Examine source code of Tab Tunnel

{
  "manifest_version": 2,
  "name": "Tab Tunnel",
  "version": "1.0.0",
  "description": "Route specific tabs through a SOCKS5 proxy based on URL patterns",
  "permissions": [
    "proxy",
    "webNavigation",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "incognito": "spanning",
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-tunnel@cleartextlabs.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}