Examine source code of MultiDictLookUp

{
  "manifest_version": 2,
  "name": "MultiDictLookUp",
  "version": "2.0",
  "default_locale": "en",
  "description": "",
  "background": {
    "scripts": [
      "dicts/pons.js",
      "dicts/dict.cc.js",
      "dicts/deepl.js",
      "dicts/linguee.js",
      "dicts/wordreference.js",
      "dicts/langenscheidt.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/translate120.png",
    "default_title": "Multi-dictionary LookUp",
    "default_popup": "popup/options.html"
  },
  "commands": {
    "tranlate-selection": {
      "suggested_key": {
        "default": "Ctrl+Alt+T"
      },
      "description": "Translate Selection"
    }
  },
  "permissions": [
    "menus",
    "activeTab",
    "storage"
  ],
  "icons": {
    "16": "icons/translate16.png",
    "32": "icons/translate32.png",
    "48": "icons/translate48.png",
    "96": "icons/translate96.png",
    "120": "icons/translate120.png"
  },
  "applications": {
    "gecko": {
      "id": "andrikod@xmail.com",
      "strict_min_version": "57.0"
    }
  }
}