The Website Read Progress extension measures the content length and considers various elements of a web article, online novel, manga, web toon etc, including comments, related content, and more to give a correct estimation of the position of your overall reading progress and remaining content.
With Markee, you can add your books and update the current page you are on, whenever you stop reading. Add notes to books if you're reading something like a biography or if it's a book that you have to read for your class, or to keep quotes in one place.