Examine source code of Quick Currency Converter

{
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "1.6.1",
  "manifest_version": 3,
  "icons": {
    "16": "resources/icons/icon_16.png",
    "18": "resources/icons/icon_18.png",
    "19": "resources/icons/icon_19.png",
    "32": "resources/icons/icon_32.png",
    "48": "resources/icons/icon_48.png",
    "64": "resources/icons/icon_64.png",
    "128": "resources/icons/icon_128.png"
  },
  "action": {
    "default_icon": {
      "16": "resources/icons/icon_16.png",
      "18": "resources/icons/icon_18.png",
      "19": "resources/icons/icon_19.png",
      "32": "resources/icons/icon_32.png",
      "48": "resources/icons/icon_48.png"
    },
    "default_title": "__MSG_extensionName__",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "https://floatrates.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bdc9fcc2-fbeb-40bf-a4db-43fa82c5ac8f}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android ": {
      "strict_min_version": "142.0"
    }
  }
}