The free EPUBReader-App is an app which enables reading ePub-files just in the browser. No installation needed!
The app uses the same reading engine as the EPUBReader Firefox add-on which is already used by more than 400,000 daily users. It runs on your local computer and transfers no data to the server.
The app runs in Firefox (15 or later), the current Chrome version and Internet Explorer (10 or later).
More information about the app and the difference to the Firefox Add-on you find here.