Examine source code of Hotkey Translator

{
  "manifest_version": 2,
  "name": "Instant Translate - Hotkey Translator",
  "version": "1.5.3",
  "description": "Translate text instantly in any text field with a simple hotkey.",
  "permissions": [
    "activeTab",
    "storage",
    "https://translate.googleapis.com/*",
    "https://api-free.deepl.com/*",
    "https://api.mymemory.translated.net/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "lib/browser-polyfill.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon.png",
      "48": "assets/icons/icon.png",
      "128": "assets/icons/icon.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon.png",
    "48": "assets/icons/icon.png",
    "128": "assets/icons/icon.png"
  },
  "commands": {
    "toggle-translation": {
      "suggested_key": {
        "default": "Alt+L"
      },
      "description": "Enable/disable automatic translation"
    },
    "translate-now": {
      "suggested_key": {
        "default": "Alt+Q"
      },
      "description": "Translate text immediately"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fastranslate@augustocesarperin.dev"
    }
  }
}