Firefox version: 25.0
Ghostery version 5.0.6
Other plugins: Adblock Plus 2.4, Tiddlyfox 1.0alpha18, Norsk Bokmål Ordliste 2.0.10.2
OS: Windows 7 SP1
When a server responds to a GET/POST from Firefox with a 302 Found, Firefox usually does not open the URL in the Location header of the response. Instead it does nothing. I can see the response in the Web developer console, so Firefox does receive the response.
Disabling Ghostery fixes the problem.
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