Searx

Searx is a free metasearch engine.

Server

A server can be setup via docker with the searx image.

Adding to Firefox

Add Searx as a new search engine for firefox and set it as main search for the
address bar as described in the Firefox article.
Follow the addon part of the guide and put searx with
<url to searx instance>/search?q=%s as search string.

Route search traffic through tor

You can setup a torproxy with the dperson image.
In the settings.yml file locate the section for proxies : and
change it to the following:

proxies :
    http : socks5://<path to torproxy server>:9050
    https: socks5://<path to torproxy server>:9050