Once installed into Firefox, click the icon in the status bar to run it.
Start typing to start the timer.
Hit Enter with your little finger after each number set.
When 30 seconds are up, it shows your score.
The first lesson is the 1 thru 9 keys in easy patterns to memorize the keys.
The other lessons add more keys: 0 . / * + -
The 12 lessons generate an endless number of 30-second drills.
It saves your best scores and 15 newest scores for each lesson.
If you lose the icon: http://creativetom2001.com/lost_icon.html
Locales: de-DE, en-US, es-ES, fr-FR, hr-HR, it-IT, nl-NL, pt-BR, sk-SK