Hi, your adapterDescription: AMD Radeon(TM) R5 Graphics driverDate: 9-25-2017 has Driver issues. Is a great card and it has updates monthly, please update monthly.

• https://support.amd.com/en-us/download

failures: [u'CP+[GFX1-]: [D2D1.1] 4CreateBitmap failure Size(20,24000) Code: 0x80070057 format 0' x2

Do the full install not the update. in future can just update if no issues. Fix your driver issue and see how it runs.

If still have problems please try : SAFE MODE

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

In Firefox Safe mode these changes are effective:

• all extensions are disabled (about:addons)
• default theme is used (no persona)
• userChrome.css and userContent.css are ignored (chrome folder)
• default toolbar layout is used (file: localstore-safe.rdf)
• Javascript JIT compilers are disabled (prefs: javascript.options.*jit)
• hardware acceleration is disabled (Options > Advanced > General)
• plugins are not affected
• preferences are not affected

TEST''''is issue still there ?

Please also Search for Device Manager and it will tell you what card version you have but please check the Driver to make sure that Microsoft has not replaced the driver with one of it's own. https://www.howtogeek.com/302595/how-to-stop-windows-10-from-automatically-updating-hardware-drivers/

Thanks, the upgrade of the AMD driver seems to have fixed the problem. oddly Windows 10 claimed it had the most recent drivers, even when I asked it to check, so I guess I will just have to keep an eye on it so Windows doesn't decide to downgrade the driver again....