Prevent Google Chrome from auto-adding custom search engines

Stop websites from adding custom search engines with this simple extension.

This extension does not connect to any third-party servers.

Its source code is available here:
https://github.com/gregsadetsky/chrome-dont-add-custom-search-engines

====

Updated July 22nd, 2019
- support for more sites (including DuckDuckGo)
- bug fixes

Updated June 16th, 2018
- support for more sites
- bug fixes"