There are not many features that the Internet Explorer posses that Firefox users have to be jealous about. The image toolbar which is the popup that appears when you hover the mouse over an image to be able to quickly access the most used image commands could be one of the features that you would like to see implemented in Firefox as well.
The Firefox extension Image Toolbar adds this functionality to Firefox giving users the following options when the mouse is hovered above an image: Save, Print, Copy, Info and Folder. While the first three are obvious the last two require some explanation. Info opens the dialog that displays information about the image while Folder opens the default download folder.
The extension can be customized. It is possible to remove any of the commands for instance. If you never print images you could remove that option. You can also define a minimum image size, the delay before the menu is shown and choose to automatically save the image instead of showing the download image dialog.
Related Articles:
Context Menu Image Saver, Speeds Up Image DownloadingFirefox Bookmarks Toolbar Tweak
Firefox Image Navigator
Image Picker, Download Multiple Images In Firefox
Firefox And Thunderbird Image Zooming