This script lets the user to mark words as favourite words when browsing Jisho.org. It stores the list of words locally in the userscript in-memory. This means that:
1. The script is not user-wise.
2. The script is intended to be used always from the same single machine.
When you visit a page for a particular word in Jisho (e. g. https://jisho.org/word/船
), the script adds a link that lets the user either to Add or to Remove the word from the list "My Words".
When you visit the user's page in jisho.org, the words in the list "My words" are listed.