Since February 2013, Stack Exchange has been offering paste/drag-and-drop insertion of images into posts. This is awesome, but it doesn't work the same on all browsers.
Google Chrome (28.0.1500.71 m) provides both paste & drag-and-drop (this feature seems to have been removed in 35.0.1916.114 m):
Firefox (22.0) only provides drag-and-drop:
Internet Explorer (9.0.8112.16421) provides none:
Why is there a deficiency in certain browsers and/or what can be done?