When the Intel HD Graphics 4600 device is disabled, problem corrects itself (first time browser opened only).
Downloaded new driver from Intel, but my system won’t install it because it’s not from manufactorer (Dell). Dell does not have a new driver for device.
I’m out of Dell warranty and want to avoid paid support if possible.
There’s a generic driver from Intel with warnings of possible problems. Avoiding
trying it for time being.
If the driver isn’t the problem then it’s the device itself. There are old posts on the web of incompatibilty of device and windows 10.