Mouse cursor fails or only partially hides in full screen mode or when hovering over content that requires the mouse to be hidden. Doing any of the mentioned results in the mouse becoming a square black block with lines through it.
System: Host: sol Kernel: 4.7.0 x86_64 (64 bit gcc: 6.1.0) Desktop: Gnome
Distro: Solus 1.2.1 shannon
Machine: System: LENOVO (portable) product: 80H1 v: Lenovo Edge 15
Mobo: LENOVO model: Lenovo Edge 15 v: 31900058 WIN
Bios: LENOVO v: B9CN16WW date: 12/26/2014
CPU: Dual core Intel Core i7-4510U (-HT-MCP-) cache: 4096 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10375
clock speeds: max: 3100 MHz 1: 2176 MHz 2: 1999 MHz 3: 1999 MHz
4: 1997 MHz
Graphics: Card-1: Intel Device 0a16 bus-ID: 00:02.0
Card-2: NVIDIA Device 1341 bus-ID: 04:00.0
Display Server: X.Org 1.18.4 drivers: nouveau,intel (unloaded: fbdev,vesa)
This may be a dual graphics issue in which case I am aware Ikey currently doesn't have access to a machine with this setup and am open for any testing to try and resolve the issue.
[Edit:] It seems this is a Intel graphics related issue at them moment not a dual graphics issue.
[Edit #2:] This issue is confirmed to be affecting more than just Firefox.