I'm using firefox from this ppa:
Just today I got Firefox 42 beta, which is the first version linked to GTK3 instead of GTK2. The problem is the Window-Titlebar of the browser is totally misplaced: it's located in the same height as the adressbar of fiefox, slightly shifted to the right, making firefox unusable. A fresh firefox userprofile did not solve the problems. What should i do else than downgrading ?