Hmm, I tried installing this plugin for Chrome, but I just get the
message "This web page has not been found"

Good catch. The searching for the entered term was indeed broken, I did not realize this needed handling different then the selection of one of the suggestions. An update with a fix for this and some other goodies [0] is now available in the Chrome web store.

[0] https://github.com/JeroenDeDauw/WikidataChromeSearch#release-notes


Jeroen De Dauw
Don't panic. Don't be evil. ~=[,,_,,]:3