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How can I use Client Certificates (SSL/X.509) on Firefox for Android?

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I installed a client certificate (SSL/X.509) on my Android phone and it works well on Chrome. However, it does not seem to work on Firefox. I tried opening a website that requires a client certificate and got a 400 Bad Request error saying I did not supply any client certificate.

I installed a client certificate (SSL/X.509) on my Android phone and it works well on Chrome. However, it does not seem to work on Firefox. I tried opening a website that requires a client certificate and got a 400 Bad Request error saying I did not supply any client certificate.