I'm not sure what is happening in your case, but it's working for me in both Thunderbird and Firefox. Could you please try with a x86_64 build from ftp://ftp.mozilla.org/pub/thunderbird/nightly/latest-comm-central/ instead of your own build?
I'm not sure what is happening in your case, but it's working for me in both Thunderbird and Firefox. Could you please try with a x86_64 build from ftp://ftp. mozilla. org/pub/ thunderbird/ nightly/ latest- comm-central/ instead of your own build?