[Feature Request] Add autosearch while editing sites list

Feature Request

While entering a site manually it will be good to see if the site/domain you are entering is already somehow defined in the list.

While needing to add a site for the stack overflow family, I noticed that I already had it in the list, but to notice that I had to scroll manually until I saw it, it would be good if while typing you could see the already listed sites that contain the word you are typing.

Expected

Screenshots

Additional Context

Text goes into list without hitting enter Maybe this is actually a BUG While getting this images I switched windows while I was still not finished entering any value (not hit enter yet,) the darkreader UI turned off and when I opened it again I noticed the text I typed had entered the list (see the "STA" last item in image).