Here is small hack that will allow you to save the pic for firefox browser

1) Open the pic in your browser and right click anywhere on the page

2)Select 'View Page Info' option and select 'Media' in the popup window that shows the page info.

3) Now browse through the list and the picture u are interested in will generally have a big hash value as its name and type as image. you can verify it by looking at the media preview at the bottom of the window.

4) Click Save As and choose your desired name and save the image.