This addon works great and I am using it now :) It will work as long as you set up everything properly. I also encountered the same problem like murph and Orolo at the beginning, but when you go to the Options to create the filter for common extensions (eg. jpg, png, gif, bmp) and specify the folder you want to save (eg. My Pictures instead of My Documents). After all the setups, when you right-click to choose "Save Link As..." or "Save Image as...", or even using QuickDrag, the addon will save the pictures silently without showing any confirmation. Duplicates? Well, I choose "Auto-increment the filename" when I set up the filter so I don't need to worry when I accidentally save the same picture with the same filename, the firefox will not pop up anything to bother me when I am viewing web pages.