I use the extension Simple Translate in Firefox because it is the only I found that shows a translate icon when I select text, see:

and displays the translation in a tooltip when I click on the icon, like this:

I would love to see the Kagi translate extension do the same, that is a very time saving feature, especially when reading a text in a language one is not fluent in, just to translate some sentences or expression.
It's "just" an UI change ;-)