No 'Image Properties' on right-click in Firefox

For some reason, i don't receive the 'Image Properties' option when i right click on an image in firefox. However, I do receive it in IE7. It also doesn't show the bounding-box when selecting the image in firefox. I only get copy/cut/paste.

Any ideas guys? Excuse me if ive asked a question already, I have searched and if you can direct me to the answer, that would be great!