Let me Leave by Snowirbis

Under the hood, this extension blocks events on the global HTML element detecting the mouse leaving the page, and the loss of focus or visibility.
The website will not know if you are doing anything else, and will let you leave the page peacefully
The extension button displays a list of the events blocked on the website.
These events can be related to the mouse, the visibility of the page, and the loss of focus (called blur)