ePub (also written as EPUB or EPub) stands for Electronic Publishing and is a standard e-book format which is used by all popular e-book readers out there, including Barnes & Noble Nook, Sony Reader, iPhone/iPod Touch (using various e-book apps), and more. ePub files have .epub extension.
Therefore, we need suitable tool in order to read epub files. After search through Internet, I’ve found EPubReader which is a handy add-on for Firefox that can directly open any ePub format quickly. It is indeed faster and quicker than desktop software and shows the graphics far better. This add-on opens the ePub file just like you can open PDF file in Firefox browser. Just hit the download link of any ePub book and select Open. If you have already downloaded the ePub book, then you can open it with Firefox.