Can't delete old search


If i going on any website and try to seach anything, i get old search words
in the context menu.
How can i remove that history. I use the duck search engine

Steps to Reproduce (add as many as necessary): 1. 2. 3.

Actual Result (gifs and screenshots are welcome!):

Expected result:

Reproduces how often:

System is linux ubuntu

Additional Information:

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