Washoe by Herman Streltsov

Extension could help you in memorization foreign or native words. Select text you want to remember (like word or phrase) and right click on it. In the context menu pick "Add %your selected text% to Washoe". Then provide word meaning and example, and click "Add".

The first time word will appear at the bottom of your screen in two minutes. Try recall it and then click on the word. Meaning and example you have provided will appear. If you recalled the word right, click Next button -- word will be pushed to the next stage. Otherwise -- click Again button and word will be reset to zero stage.

Stages are: 2 minutes, 10 minutes, 1 hour, 5 hours, 1 day, 5 days, 25 days, 4 months