Personally, I much prefer search engines that work without javascript enabled at all (currently using Metager). I use strict uBlock Origin settings as well as various other strict browser settings like blocking third party cookies. I'm not sure how much of that you want to try to support (or what is causing my issue - the site does not work at all for me, even after enabling javascript), but trying on Firefox with default uBlock Origin settings if you haven't would be one way to check a somewhat common setup. Oh, my issue could also be the referer related settings as mentioned below.