Firefox and epubs and email queries

[Linux for blind general discussion]

So a few questions

1. I know about epubviewer, but since I'm writing this from a laptop, 
any other good alternatives for epubs?
2. What's the closest I can get to Seamonkey's built in email with Firefox
3. Can I mass download attachments with Gmail's web interface? There 
used to be an addon for Thunderbird but I forgot if it got discontinued 
or not