Show Image context menu item
From MozillaZine Knowledge Base
Currently there is no Show Image context menu item in Firefox.
To have this feature added to the browser install one of the following extensions:
- The ImgLikeOpera extension
- The Adblock Plus extension
- The Show Image extension, which includes a preference that adds a 'Reload' item to the context menu, when set to true in about:config:  extensions.showimage.display_reload_image_context_menu