Download MarkBook chrome extension. Mark, highlight and arrange your favor words and images on web page, and export as PPT to share with your friends. and install in your Google chrome browser. This is Direct MarkBook Crx download for Chrome it is also called MarkBook offline CRX for chrome Download. This MarkBook is used to Mark, highlight and arrange your favor words and images on web page, and export as PPT to share with your friends.