Block Browser Back Blocker

This extension allows you to force a return to the previous page on sites that pop up when you press the back button. In recent years, there are many sites that detect when the back button is pressed and display a pop-up to prevent users from leaving. Since the user wants to leave the site when they press the back button, preventing them from doing so only detracts from the user experience. This extension eliminates the hassle of not being able to return to the previous page after pressing the back button.

Screenshots from Chrome Web Store

Screenshots from Mozilla Add-ons