This add-on is working for me now. I opened an existing ePub file on my PC: the left panel shows the TOC; the right panel shows the text/images with proper justification and all.
1. I can already view ePub files via ADE or the eBook Library. Therefore, other than being able to view an ePub from my Firefox browser, can you explain why I would need to use this add-on?
2. The chapters seem to be all one page and are read by using the scroll bar or wheel to advance through the entire chapter. Was this your intention?
3. To continue to the next chapter, I must click the TOC in the left panel to continue reading. Is this how the reader is supposed to work?
Nicely done, I just have to figure out a need for it.