diff --git a/.hgignore b/.hgignore
--- a/.hgignore
+++ b/.hgignore
@@ -8,3 +8,4 @@ tmp/
 dist/
 django_conntrackt.egg-info/
 projtect/.coverage
+test_binaries/
\ No newline at end of file
diff --git a/MANIFEST.in b/MANIFEST.in
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -27,4 +27,5 @@ recursive-include conntrackt/templates *
 recursive-include docs *
 recursive-include requirements *
 recursive-exclude * *.py[co]
-recursive-exclude docs/_build *
\ No newline at end of file
+recursive-exclude docs/_build *
+recursive-exclude test_binaries *
\ No newline at end of file
diff --git a/docs/development.rst b/docs/development.rst
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -62,6 +62,40 @@ 4. Install required packages in the virt
 
      workon conntrackt && pip install -r ~/projects/conntrackt/requirements/development.txt
 
+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
+
 
 Development/test Django project
 -------------------------------
diff --git a/requirements/development.in b/requirements/development.in
--- a/requirements/development.in
+++ b/requirements/development.in
@@ -32,4 +32,7 @@ mock~=1.3.0
 sphinx~=1.6.0
 
 # Used for handling of timezones.
-pytz
\ No newline at end of file
+pytz
+
+# Used for running functional tests.
+selenium~=3.8.0
\ No newline at end of file
diff --git a/requirements/development.txt b/requirements/development.txt
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -22,11 +22,12 @@ markupsafe==1.0           # via jinja2
 mock==1.3.0
 palette==0.2
 pbr==3.1.1                # via mock
-pydot==1.2.3
+pydot==1.2.4
 pygments==2.2.0           # via sphinx
 pyparsing==2.2.0          # via pydot
 pytz==2017.3
 requests==2.18.4          # via sphinx
+selenium==3.8.0
 six==1.11.0               # via mock, sphinx
 snowballstemmer==1.2.1    # via sphinx
 sphinx==1.6.5
diff --git a/requirements/test.txt b/requirements/test.txt
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -22,11 +22,12 @@ markupsafe==1.0           # via jinja2
 mock==1.3.0
 palette==0.2
 pbr==3.1.1                # via mock
-pydot==1.2.3
+pydot==1.2.4
 pygments==2.2.0           # via sphinx
 pyparsing==2.2.0          # via pydot
 pytz==2017.3
 requests==2.18.4          # via sphinx
+selenium==3.8.0
 six==1.11.0               # via mock, sphinx
 snowballstemmer==1.2.1    # via sphinx
 sphinx==1.6.5
diff --git a/test_binaries/.keep b/test_binaries/.keep
new file mode 100644