$ sudo apt-get remove iceweasel-sage

Uninstall iceweasel-sage including dependent package

If you would like to remove iceweasel-sage and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove iceweasel-sage

Use Purging iceweasel-sage

If you use with purge options to iceweasel-sage package all the configuration and dependent packages will be removed.

$ sudo apt-get purge iceweasel-sage

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove iceweasel-sage

See Also,