Using webrtc no sound is recorded on Windows 8.1

Trying to use webrtc on either Firefox Hello or another website making use of webrtc features (such as https://tokbox.com/opentok/quick-start/demo.html) for communication will make Firefox show the dropdown to select a microphone and authorize it's use. The connection is established just fine, I can hear other people talk (or myself if I connect with another browser), but my own microphone is not picked up. I am very confident that my windows settings as well as those in driver's application are correct, but I'm happy to try aynthing out.
I'm thankful for any help you can provide.

Can you check what the sample rate of the input device is set to?
If you go into the Sound part of the control panel, select Recording, and then Properties on the default mic you'll get a properties dialog up.
On the properties dialog, go to Advanced, and check what the Default Format is.
Check that the Hz is either 48000Hz or less (the channel and bits shouldn't matter).
Please let us know if that helps or not.

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