I've been experiencing this issue for a while. Double clicking any word would see an infinitely loading pop-up window. And when I looked at the debug window of the extension:

It seems that when the google search is relocated to origin https://www.google.com.hk, an error would occur and the search request would fail, resulting in no search result given. I've tried to disable google relocation, but even though my web search is not relocated, the extension didn't change. I sincerely hope this could be fixed.