ericn@ericsam:~$ dpkg -l | egrep "(thunderbird|firefox)"
ii firefox 17.0+build2-0ubuntu0.12.04.1 Safe and easy web browser from Mozilla
ii firefox-globalmenu 17.0+build2-0ubuntu0.12.04.1 Unity appmenu integration for Firefox
ii firefox-gnome-support 17.0+build2-0ubuntu0.12.04.1 Safe and easy web browser from Mozilla - GNOME support
ii firefox-locale-en 17.0+build2-0ubuntu0.12.04.1 English language pack for Firefox
ii thunderbird 17.0+build2-0ubuntu0.12.04.1 Email, RSS and newsgroup client with integrated spam filter
ii thunderbird-globalmenu 17.0+build2-0ubuntu0.12.04.1 Unity appmenu integration for Thunderbird
ii thunderbird-gnome-support 17.0+build2-0ubuntu0.12.04.1 Email, RSS and newsgroup client - GNOME support
ii thunderbird-locale-en 1:17.0+build2-0ubuntu0.12.04.1 English language pack for Thunderbird
ii thunderbird-locale-en-us 1:17.0+build2-0ubuntu0.12.04.1 Transitional English language pack for Thunderbird
Still present in Precise:
ericn@ericsam:~$ dpkg -l | egrep "(thunderbird| firefox) " 0ubuntu0. 12.04.1 Safe and easy web browser from Mozilla 0ubuntu0. 12.04.1 Unity appmenu integration for Firefox gnome-support 17.0+build2- 0ubuntu0. 12.04.1 Safe and easy web browser from Mozilla - GNOME support 0ubuntu0. 12.04.1 English language pack for Firefox 0ubuntu0. 12.04.1 Email, RSS and newsgroup client with integrated spam filter globalmenu 17.0+build2- 0ubuntu0. 12.04.1 Unity appmenu integration for Thunderbird gnome-support 17.0+build2- 0ubuntu0. 12.04.1 Email, RSS and newsgroup client - GNOME support locale- en 1:17.0+ build2- 0ubuntu0. 12.04.1 English language pack for Thunderbird locale- en-us 1:17.0+ build2- 0ubuntu0. 12.04.1 Transitional English language pack for Thunderbird
ii firefox 17.0+build2-
ii firefox-globalmenu 17.0+build2-
ii firefox-
ii firefox-locale-en 17.0+build2-
ii thunderbird 17.0+build2-
ii thunderbird-
ii thunderbird-
ii thunderbird-
ii thunderbird-