Does almost everything I ask for:
- Draws on the screen
- Allows you to change the screen behind the drawing while leaving the drawing on the screen
- Has convenient keyboard shortcuts

Literally the only thing I wish it would have is the option to add a shadow (ideally also a customizable color) behind the marker so that it shows up easier on a variety of website backgrounds. Otherwise, this is extremely useful for virtual teaching.

would be perfect except i have to remember to click the extension icon again for my marks to show up when returning to a web page.