Потрібен браузер Opera.
Правила конфіденційності
Stone to KG Converter does not collect, transmit, or sell personal information. The extension performs all weight conversions locally on your device. Any data stored using the browser storage API is limited to user preferences and is never shared with third parties. Clipboard access is used only when you choose to copy a conversion result. For more information, please visit: https://stonetokg.uk/privacy-policy