I used this add-on everyday a few years back before it changed because of compatibility and became unusable. Was hoping it changed since then but it looks even worst... I'm really missing that 1.6 version... :'(
Version 2 was created because Firefox changed the extension API to webextensions. This also caused some limitations. To claim, that EPUBReader is unusuable since then seems to me exaggerated, as you still can read epub files in Firefox.
