5. Download and unpack `Mozilla Firefox

   <https://www.mozilla.org/en-US/firefox/>`_ version **57.0.x** for

   your platform into directory ``test_binaries/``. If using 64-bit

   GNU/Linux distribution, this should be as easy as:

   .. warning::

      In order to ensure the functional tests run well, it is

      important to use correct combination of geckodriver and Mozilla

      Firefox.

   ::

      workon conntrackt && \

          cd test_binaries/ && \

          wget 'https://ftp.mozilla.org/pub/firefox/releases/57.0.2/linux-x86_64/en-US/firefox-57.0.2.tar.bz2' && \

          tar xjf firefox-57.0.2.tar.bz2

6. Download `geckodriver

   <https://github.com/mozilla/geckodriver/releases>`_ version

   **v0.19.1**. If using 64-bit GNU/Linux distribution, this should be

   as easy as:

   .. warning::

      In order to ensure the functional tests run well, it is

      important to use correct combination of geckodriver and Mozilla

      Firefox.

   ::

      workon conntrackt && \

          cd test_binaries/ && \

          wget 'https://github.com/mozilla/geckodriver/releases/download/v0.19.1/geckodriver-v0.19.1-linux64.tar.gz' && \

          tar xzf geckodriver-v0.19.1-linux64.tar.gz