With the PopClip extension, you can easily highlight words with your mouse and instantly add them to your vocabulary.
Install the following PopClip extension (select the full YAML content):
#popclip
name: AI Voc Builder
icon: iconify:material-symbols:collections-bookmark
url: http://127.0.0.1:16093/?text=***If you are not using the default host and port when starting the notebook service, change the URL above.