Sorry for slightly cross-posting...

So near, and yet so far,

I've installed Fennec.

Then, I've gone into about:config and added:
"general.useragent.override" = "Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:10.0.1) Gecko/20100101 Firefox/10.0.1"

Now, going to read.amazon.com, I get my list of books (yay!) but it doesn't seem that Fennec is giving the local storage needed to download and read a boo (boo).

(I get the 'Error Opening Content' error message)

Darn...