Banger by Zephyr

A Firefox extension that adds DuckDuckGo-like !Bangs to any search engine, in addition to adding exclusive related features.

Banger fetches a list of bangs from DuckDuckGo, letting you access their latest list of bangs.
All processing is done client-side, so bang execution is faster than usual.

To learn more, see https://github.com/WhistlingZephyr/banger