This pertains to jpegs, png, and any other type of image.
Here are two very simple examples:
1. Gamersyde.com, a popular news site for video games. Visit the link below, which shows images of an upcoming game. View the web page in both Firefox and IE10. Click on one of the images, it will open in another window. In Firefox you can right click and
choose 'view image', and it will display the image at its original resolution and by itself. Right click in IE and you don't have the option. You can see 'show picture', which should have the same functionality, but it isn't available to click on.
http://www.gamersyde.com/gallery_21491_en.html
2. Just do a simple google search for Halo 4 or something, anything. Click on 'images' at the top. Click on the first image or any image so it expands. Right click on the expanded image in Firefox and you can choose 'view image'. It will display the image
at its original size, and if the image is too big for your screen resolution you can just left click on image and use the +- to view it original size. Again, IE has 'show picture' but it is greyed out and not clickable. Firefox shows the image by itself with
'view image' just as it should, but although IE shows the option it isn't functional. This is really irritating and NO browser should be without this simplest of simple, but yet very useful, functions. And although it's very irritating in Chrome because it
always opens the image in a new tab, 'open image in new tab' provides the same function, just more irritating. IE provides nothing. Actually, it's there, but you can't use it!