My understanding is that eyes are usually enlarged slightly during this kind of editing; so I hope you don't mind that I did that, and a little bit of facial sculpting.
What do you think of this?
I hope I don't offend anyone by saying this, but I think race is important here. Can you choose a sample photo of somebody with a similar complexion to your subject?
I'm always very concerned about using lamps. Their light is so ... directional, you know?
Just to check - have you read this? https://www.damiensymonds.net/2012/01/light-around-your-computer.html
Phew.
As it happens, you got lucky this time, because we do need that duplicate layer. You need to apply some Gaussian Blur to it - just enough to get rid of the distinct fabric lines, eg around your hand. I think about 0.6 will do.
Then mask that layer too.
Gosh, that's odd. No, no problems with Firefox and Windows 10 here.
Does it crash immediately when you launch Firefox, or randomly while you're browsing later?
No, it's to dangerous to put it on Duplicate, sorry. Leave it on Extend, and try making it the main display as I suggesed.
Sure, maybe that would help!
Don't worry about this. As I said, the computer will know.