add searx search engine
I'm using this meta search engine for some time now. It is not perfect, but it exists. I would be happy to see it in the tbb's list of search engines.
Overview: Searx is a free software internet metasearch engine which aggregates results from other search engines, while not storing information about its users. Searx does not track or profile its users, nor does it share its users’ data with third parties. Additionally, searx can be used over Tor for online anonymity.
List of running instances: https://github.com/asciimoo/searx/wiki/Searx-instances ^^^^ some of them are available as hidden service !