Using GNFF 8.2.2 with Tampermonkey 4.6 in Chrome 66/Firefox 60 (tested in a new profile too).

The issue is that the script's tab titles (Actions, Repositories, Users) appear tiled vertically after today's GitHub site update (i.e. the updated search bar I think)

Here is a screenshot from FF:

There's no error in Browser Console.
Unfortunately I couldn't find how to fix this.