[Osiris]

Some images at Flickr are weakly protected with an image overlay called spaceball.gif. Whenever you right-click the image to save it you do save spaceball.gif instead which is a 1×1 pixel image showing nothing at all. The same happens if you try to drag the image to your desktop or hard drive.
However, if a photo is show it can be saved. The easiest way to achieve this is by blocking spaceball.gif from being loaded when visiting Flickr. You can do this in Firefox if you have the Adblock extension installed. When you are viewing an image at Flickr that you can’t save because of the spaceball.gif overlay you do the following to block the overlay.
Hit CTRL + SHIFT + B to open the list of blockable items. Navigate to the entry with spaceball.gif at the end and choose to block this item by right-clicking it. This prevents that spaceball.gif is loaded so that you can save any items at Flickr by right-clicking it.
Opera has a similar function. Just go to Tools > Advanced > Blocked Content and click Add in the menu. Paste the url *flickr.com/images/spaceball.gif into the new entry and close the menu.
via Cybernetnews