"You can use a dedicated application like FBReader or Calibre to read and manage ebooks on your machine, or you can do it without leaving the convenience of the Firefox browser courtesy of the EPUBReader extension.
"With this extension, you can open any ebook in the ePub format directly in the browser using the File -> Open File command. EPUBReader conveniently splits the main window into two panes. The left pane contains the hyperlinked table of contents, while the right pane displays the book."
