iceweasel-sage software package provides virtual package provided by xul-ext-sage, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install iceweasel-sage
iceweasel-sage is installed in your system.
Make ensure the iceweasel-sage package were installed using the commands given below,
$ sudo dpkg-query -l | grep iceweasel-sage*
You will get with iceweasel-sage package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Virtual packages |
| Package | iceweasel-sage |
| Version | |
| Description | virtual package provided by xul-ext-sage |
| Sub Section | virtual |