Search “@ rfindley” (no space) and “lesson count” for that link to the Dashboard to stay PERSISTENTLY at the top of the page, even when scrolling down. (Plus, you’ll have your lesson and review counts always reminding you they’re there, as well!) It’s a great userscript that I previously requested.
And you know, like Viet pointed out, it is already there (but you have to scroll back up).
Here, I’ll just link you: rfindley’s Lesson/Review Count script, aka persistent Dashboard link.