Examine source code of Selection Translate

{
  "manifest_version": 3,
  "name": "Selection Translate",
  "version": "1.0.9",
  "description": "Translate any selected text inline. Free, no account. On-device translation, with cloud fallback (opt-in).",
  "permissions": [
    "contextMenus",
    "storage",
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "https://ai-proxy-production-6b92.up.railway.app/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Selection Translate",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "commands": {
    "translate-selection": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description": "Translate the currently selected text"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "selection-translate@extendforge.com",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}