I just found a good method to convert any website to epub with Firefox and 2 addons.
http://www.grabmybooks.com/
Quote:
GrabMyBooks is a Firefox addon that allows you to grab content from the web and easily convert it in an epub / mobi file fully compatible with your reader.
Here is a glimpse of how GrabMyBooks works:
Select automaticaly or manualy the content to extract from the web sites you visit or from rss/atom feeds.
Visualize and edit your book.
Get your epub / mobi file ready to be transfered to your ebook reader.
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Open in each tab the page you want as chapter, then choose "grab tab" in the up right grabmybooks menu (green icon).
Choose a cover, and a Title for your Epub in "My Book" in menu (green icon).
Save your epub.
Use linky addon to simply open all links of a page in different tab.
https://addons.mozilla.org/en-US/firefox/addon/linky/