Is there a Broswer on Ipad capable of "Add a Keyword for this Search" (or Quick Searches) feature? On desktop, Mozilla Firefox has a nice feature to define a smart keyword to enable searching a website through the browser. The details can be found here. This feature is sometimes called Quick Searches.

On IPad, neither Safari, nor Firefox seem to have this feature.

Is there a browser on IPad, capable of this feature?
I've used the Cliqz browser on my iPad and it works well. It has a quick search feature but maybe different from the one you describe. Cliqz is free and available from the app store.