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A firefox addon which adds bangs (known from duckduckgo) to various search engines.

The following ones are supported:
Bing, Ecosia, qwant, google and startpage.
In addition it allows you to add custom bangs to these sites (via the preferences page of the add-on).
It also allows you to change the bang prefix (e.g. # instead of !)
Source: https://github.com/sophie-glk/bang