Hello all and 
A few days ago I install new (for me & my PC) OS - Linux Mint.
And when I try Mozilla Firefox (version 50.0.2)
I found such trouble:
I can't scroll upper - to see and to chane the coordinates.
And any other troubles in front-end on other pages.
And no any resize to small scale can fix this problem :(
The whole resolution of my display is 1280:800 (12'').
Read next
From @shenan