GCComment is a extension for www.geocaching.com. It works with Tampermonkey and Firefox, Google Chrome, Opera and Microsoft Edge. With GCComment, you can create, manage and print your personal comments for geocaches on geocaching.com. Moreover, you can mark final locations of caches on the map.
Install Tampermonkey: https://tampermonkey.net/
Install the script: https://raw.githubusercontent.com/Birnbaum2001/GCComment/master/src/gccomment.user.js