Invalid csrf_token in Firefox 37

[jomo]

It won't post any benchmarks using Firefox 37.

The GET request seems to work, but the subsequent POST errors with:

CSRF Error - Invalid csrf_token.

It does work on other browsers and older versions of Firefox.
What's odd is that the csrf_token sent in the POST request is the one specified in the csrf_token variable from the previous GET request.

I assume that this may have other reasons than the csrf token. I have tested this with all addons disabled.
(It could still be something from by about:config if this is happening to me only.)

Edit: Forgot to mention, I'm on OS X Yosemite 10.10.1

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I wasn't sure if this should be reported to browsercope or here.
Related? #89

[jomo]

Apparently this is no longer happening