Install the extension to have the functionality right when and where you need it!
The Heureca Extension is a Chrome Extension that can be installed through the Google Chrome Web Store. Once installed it will automatically appear on the geocaching.com pages next to description of Mystery or Multi Caches.
The extension will not only run on the geocaching.com page, but it will also support you on Checker pages where your solutions will be inserted into the forms automatically.
If you are not using Google Chrome or want to use Heureca from a mobile device, pleace check again: Heureca will be available here as simple webpage soon and we are working on turning it into an addon for Firfox.