Hello there,

Have you tried disabling all your add-ons / extensions from Firefox and see if the issue still persists?

You can try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Hello to all

if you have Sophos AntiVirus (or security suite) try to update it to latest and check it again.

thank you