Keep track of your progress!
Mark any page as Done. Then all links to that page are marked with a colorful icon.
This allows you to browser through a big documentation, while keeping track of the completed pages.
PLEASE NOTE: after installing, open "Window", "Extensions", "mark as done: Details". Below "Site access" select "On specific sites", add one site to start with like "http://example.com/*". Further sites can be added through the extension UI itself.