.. _firefox-tor-linux:

************************************
Setting up Firefox with Tor on Linux
************************************

.. warning::
  This guide assumes you have completed :ref:`setting up Tor for Linux<tor-linux>`. Please visit this section first before you proceed as it is required for Firefox to properly work with Tor.

Open Firefox.

Enter ``about:config`` in the URL bar. Accept any warnings that may appear about accessing advanced settings.

Search for ``dom.securecontext.whitelist_onions`` and set the value to ``true``.

.. figure:: /_static/images/tor/firefox_whitelist.png
  :width: 80%
  :alt: Firefox whitelist onions screenshot

Next, in order to tell Firefox which urls to use Tor for, you need a `Proxy Auto Config` file. We have one hosted `here <https://registry.start9labs.com/sys/proxy.pac>`_. To get it, you can run:

.. code-block::

  sudo wget -P /etc/tor https://registry.start9labs.com/sys/proxy.pac

Now open your Firefox web browser, and select preferences:

.. figure:: /_static/images/tor/firefox_preferences.png
  :width: 80%
  :alt: Firefox preferences screenshot

  Select :menuselection:`Settings --> Preferences`

Search for the term “proxy” in the search bar in the upper right, then select the button that says `Settings…`:

.. figure:: /_static/images/tor/firefox_search.png
  :width: 80%
  :alt: Firefox search screenshot

This should open a menu that will allow you to configure your proxy settings. Select `Automatic proxy configuration URL` and paste in:

.. code-block::

  file:///etc/tor/proxy.pac

Then, check the box labeled `Proxy DNS when using SOCKS v5`:

.. figure:: /_static/images/tor/firefox_proxy.png
  :width: 80%
  :alt: Firefox proxy settings screenshot

Click ``OK`` and then restart Firefox for the changes to take effect.

Now you’re all set! You should now be able to navigate to `.onion` URLs in Firefox. This means you can bookmark Cups Messenger, and use your Bitwarden Tor address in the `Bitwarden Firefox Plugin <https://addons.mozilla.org/en-US/firefox/addon/bitwarden-password-manager/>`_.