Hello guys!Thanks to Arch Linux user kitsunyan, there's a patch provided by him which can fix the extension ID isssue. Also, this patch fix the theme installation.
Here's the link: https://raw.githubusercontent.com/kitsunyan/foxy-overlay/ace020013799a88c722e1b727b363fe2f06a5f61/www-client/icecat/files/fix-addons.patch
Wish Ruben Rodriguez can merge this. -- http://gnuzilla.gnu.org
