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How can I find out which web frameworks/java-script libraries a site uses, specially their versions from a web-browser like Firefox or Chrome?

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closed as off topic by Bobby, Sathya, quack quixote Jun 1 '10 at 1:59

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Not an answer, but there is no way to be 100% sure about the web framework they are using without having access to their servers. The best you can do is make guesses based on the structure of the website, or comments in code, etc. As for JavaScript libraries, you can just click View Source in your browser. :) – Sasha Chedygov May 31 '10 at 8:55
This is off-topic: Might be better suited for WebCheatSheet or something like that. – Bobby May 31 '10 at 10:22
this may be appropriate to Doctype, but i'm not very knowledgeable about that site. check their FAQ before posting. – quack quixote Jun 1 '10 at 2:00

This is pretty good and does most/all of the work for you.

Detect CMS, framework and technologies being used by a website

Also this question over at Stack Overflow gives quite a few tips.

How do you determine what technology a website is built on?

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