http://www.jacquet80.eu/mozilla/exts/ServerSpy/Displays the brand of web servers in the status-bar.Server Spy Firefox Extension.
extension that displays the brand of web servers
(e.g. Apache, IIS, etc.) in the right-hand side of the browser window's status
bar. When a tab is selected, Server Spy shows the name of the server that has
served up the corresponding page.
The following screenshot shows the extension in action.Server SpyFirefoxExtensionFirefox Extensions