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Is there a FireFox plugin that tells you what web server (httpd, Tomcat, IIS), platforms (Drupal, WordPress, Rails, PHP, .NET, Java) and client-side (JavaScript, HTML5, Flex) technologies a particular web site uses?

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Wappalyzer will do this for many tools.
Note that some may not be possible, and also that there are ways to obfuscate some of them(eg. installing to non-standard locations) that might break detection, depending upon the particular method used.

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