Custom Bang Search is a search tools chrome extension. it's a free extension , it has 37 active users since released its first version, it earns an average rating of 5.00 from 2 rated user, last update is 623 days ago.
A web extension that allows you to use DuckDuckGo-like custom bangs directly from the address bar. Currently only works if you have Google, Bing, DuckDuckGo, or Qwant set as your browsers search engine. See the GitHub page for more info.
You could download the latest version crx file or older version files and install it.
English.
100% user give 5-star rating. Read reviews of custom bang search
You could find more help information from custom bang search support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of custom bang search.
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Finally found an extension that does just what I needed.