Codex Reader by Kalp Abhinn Aghada

Use this extension to turn any webpage into a book, with a table of contents on the side. Use left and right arrow keys to flip the pages of your book, and up and down arrow keys to flip the pages of your table of contents.

3 days trial, $5 / year after.

Works great on websites with a lot of reading material, like Project Gutenberg's online books. This extension is not recommended for use on important websites, like banking websites, online examinations, or the like.

Allow popups for this extension to work. After initial install and providing your email address in the pop up window, refresh the page for the extension to start.