Either way, the user agent responds by presenting a user interface that prompts the user to choose the screen area to share. Both of these implementations of startCapture() return the MediaStream containing the captured display imagery.
Taken from MDN description of screen share API
When you press the screen share button, the browser shows you a list of ...
tl/dr: It's definitely a plugin doing this, and is almost certainly a privacy-focused plugin that is trying to randomly
obfuscate your user agent and plugin list to hide you from sites
performing browser fingerprinting. However it is doing it very poorly
and I'm dubious that the people who wrote this knew what they were
doing. So while there likely isn't a ...
For example can it track the ID of the browser (if there is such
thing), or the ID of the computer / internet session?
No,If you changed chrome user account and the gmail associated with it and didn't use any sync methods,all the cookies and data would be invalidated from the first user to the second,there would be no sure way for example.com to figure it ...
how is two people using two accounts on the same device different from one user using two accounts in the same device from the point of view of example.com?
Nothing. example.com may know that there is two accounts connected to itself on the same device and even know that accounts are open in the same browser, but can only guess whether it is the same person ...
What you're asking for is a hands-off, unauthenticated way to say "I'm the same client you saw yesterday". There's already an answer for that: cookies.
Adding self-issued client certificates adds a lot of complexity but solves no problems. There's nothing to trust on a self-signed certificate.
Adding CA-signed client certificates removes ...
If its a personal laptop, they cant get your browsing history. Also, even if your are signed in to your work account, your search history on bing cannot be shared as confirmed by Microsoft.
"Your specific work search history isn't shared with your company or other companies, including Microsoft."