When I type in search words in the google box and then drop down to the search that matches what I want, and click on it, it does absolutely nothing. It used to complete the search, how do I get it to complete the search?

Here is an example: I type Denver Dum in the google box. It gives me several options, one is Denver Dumb Friends League, which is what I want. I bring the cursor to Denver Dumb Friends League and click. It does nothing. The google box still has Denver dum in it. The only way to get a search to be completed is if I type in the whole phrase and hit enter. How do I get it to search using just part of a phrase? It used to do this before I upgraded to the newer version of firefox. Thanks!