N.B. - Trending searches are not the same as search suggestions. Search suggestions happen when you type in a term like "dance" and it finds various dance-related terms to search on. Trending searches is what everyone else is searching on at this moment - usually things in the news headlines, celebrity stuff and other uselessness.
I don't have this problem on Chrome, only on Firefox. In another thread someone suggested running AdBlock Plus, but I'm running that, turned up to the max, and it makes no difference. OS is Windows 10. Latest version of Firefox.
EDIT: added image