Better Than Most Rated 5 out of 5 stars
I've tried various fancier eReader apps, and this simple add-on works better than all of them. It isn't as pretty as others, but does the job better. My one complaint is that it needs better help files on how things all work, like the Sync/Import/Export page, etc. Oh, and can we add more bookstores to it?
If you have Firefox already, just use EPUBReader instead of adding another app.