You can uninstall or removes an installed iceweasel-adblock-plus-element package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove iceweasel-adblock-plus-element
If you would like to remove iceweasel-adblock-plus-element and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove iceweasel-adblock-plus-element
If you use with purge options to iceweasel-adblock-plus-element package all the configuration and dependent packages will be removed.
$ sudo apt-get purge iceweasel-adblock-plus-element
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-adblock-plus-element