Block Image|Video is a Firefox addon designed to enhance user control over web content by enabling the blocking or hiding of images and videos with simplicity. Once installed, users can easily manage their preferences through a dedicated toolbar button that indicates the addon's active status. The interface allows users to select specific items to block or hide, providing flexibility in how content is displayed while browsing. By default, no items are selected, ensuring that users can tailor their experience according to their needs.

The addon's functionality is twofold: users can choose to hide items, which keeps them loaded but invisible, or block items entirely, preventing them from loading at all. This feature can lead to faster page loading times when certain media elements are not needed. However, it is important to note that once an item is blocked, it cannot be made visible again without disabling the addon. Overall, Block Image|Video offers a straightforward solution for those seeking to customize their online experience.