Screen Share Warning makes active sharing unmistakable. It shows a bold banner in the top bar and, optionally, a border around the primary monitor so you can’t miss when your screen is being shared. A preview toggle lets you verify the look without starting a real share. Configurable options: - Warning text - Panel background color - Warning text color - Blink interval - Border on/off - Border thickness”

Extension Homepage

https://github.com/wilderbridge/screenshare-warning