Hi Tyler Orr,
Sorry for my later reply.
I have been told that, the security certificate may be updated in the last Friday evening.
Today, I have checked the MCUXpresso SDK website again, it works on my firefox now.

So, you can try it again on your side.
If you still have problems, please let me know.
Sorry for the inconvenience we bring you.
Have a great day,
Kerry
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