I can reproduce the issue with Firefox (45.0.2) on an ArchLinux Gnome VM, on Windows I’m up-to-date with Firefox 47.0.1.
Also it should be noted that the cursor stays at this position even when typing something:
I can reproduce the issue with Firefox (45.0.2) on an ArchLinux Gnome VM, on Windows I’m up-to-date with Firefox 47.0.1.
Also it should be noted that the cursor stays at this position even when typing something: