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sudo apt-get purge firefox

[sudo] password for mikolotko:

Reading package lists... Done

Building dependency tree      

Reading state information... Done

The following additional packages will be installed:

  thunderbird

Suggested packages:

  thunderbird-gnome-support ttf-lyx

The following packages will be REMOVED:

  firefox*

The following NEW packages will be installed:

  thunderbird

0 upgraded, 1 newly installed, 1 to remove and 0 not upgraded.

Need to get 0 B/33.4 MB of archives.

After this operation, 19.4 MB disk space will be freed.

Do you want to continue? [Y/n] y

Selecting previously unselected package thunderbird.

(Reading database ... 242346 files and directories currently installed.)

Preparing to unpack .../thunderbird_1%3a38.8.0+build1-0ubuntu0.16.04.1_amd64.deb ...

Unpacking thunderbird (1:38.8.0+build1-0ubuntu0.16.04.1) ...

Processing triggers for bamfdaemon (0.5.3~bzr0+16.04.20160523-0ubuntu1) ...

Rebuilding /usr/share/applications/bamf-2.index...

Processing triggers for desktop-file-utils (0.22-1ubuntu5) ...

Processing triggers for mime-support (3.59ubuntu1) ...

Processing triggers for man-db (2.7.5-1) ...

dpkg: firefox: dependency problems, but removing anyway as you requested:

 xul-ext-ublock-origin depends on firefox (>= 24.0) | thunderbird (>= 31.0) | seamonkey (>= 2.21); however:

  Package firefox is to be removed.

  Package thunderbird is not configured yet.

  Package seamonkey is not installed.

 

(Reading database ... 242450 files and directories currently installed.)

Removing firefox (47.0+build3-0ubuntu0.16.04.1) ...

Purging configuration files for firefox (47.0+build3-0ubuntu0.16.04.1) ...

Processing triggers for man-db (2.7.5-1) ...

Processing triggers for bamfdaemon (0.5.3~bzr0+16.04.20160523-0ubuntu1) ...

Rebuilding /usr/share/applications/bamf-2.index...

Processing triggers for desktop-file-utils (0.22-1ubuntu5) ...

Processing triggers for mime-support (3.59ubuntu1) ...

Setting up thunderbird (1:38.8.0+build1-0ubuntu0.16.04.1) ...