I tried it, and it almost works. I clicked through the whole DriversEd in about 2 hours (would have taken me at least several days otherwise).

Here are some comments:
1. After installing GreaseMonkey, you need to change the page URL pattern as follows:
https://driversed.com/trafficschool/courseware/*

2. Auto-clicking "next" button for pages does not work (would be really cool if it did).

3. Auto-stopping on test pages also does not work. In fact, for whatever reason, the script did not auto-click through regular pages, but tried to auto-click through test pages. I had to keep disabling it on test pages (just click on greasemonkey icon at the bottom right hand corner of your firefox).

But regardless of the script not being perfect, it is still EXTREMELY USEFUL. You can manually click through all pages (except for movie pages) without any delays.