QuickBlock is made up of two content blockers (an image blocker and a script blocker) that can be turned on and off separately. Each content blocker internally uses your browser's built-in content blocker that targets the same content type to block contents efficiently. For example, if you turn on the image blocker, it temporarily takes control of the built-in image blocker to block images for all websites. And if you turn it off, the built-in image blocker is restored to its original settings. You can turn content blockers on and off using: - toolbar icon - keyboard shortcut For more information, see "QuickBlock User Guide" (click "Website" on the right side of this page).