IceCat security problem!
It seems the project may have been abandoned and they aren't patching security fixes. If you're using IceCat you are likely at risk...
http://lists.gnu.org/archive/html/bug-gnuzilla/2015-09/msg00011.html
I don't think it's correct to say that IceCat has been abandoned, but yes, using it is a security risk. I've switched back to Abrowser, personally.
Is it a hard problem or is just no one working on it?
It seems that Ruben has disappeared. I was planning to switch to IceCat, but I decided to stay with Abrowser because of the security issues.