Image Block is a Firefox add-on that has been designed for the purpose of preserving bandwidth by blocking images from being loaded during the retrieval of a website. A button has to be placed in one of the Firefox toolbars before the add-on can be used. This is done by right-clicking free space on a toolbar and selecting customize. All it takes then is to locate the Image Block icon and drag and drop it into a location on a toolbar.

Pressing the button will automatically block images in Firefox. This is valid for all open tabs in the web browser. Below is a screenshot of Ghacks with blocked images.

A second click on the button will enable image loading again. Image Block can be a very handy add-on in situations where the Internet is accessed with a slow Internet connection. The developer mentions that it can also come in handy when surfing sites of questionable content (to avoid viewing nasty pictures) or at work (to better hide the nature of the website).