So, via the 54.0.1 variant of Firefox, launching alexa.amazon.com never finishes loading. Get Amazon Alexa and the "it's loading spinning circle image."
Reached out to Amazon tech support and their first question was does it work from Chrome. I don't have Chrome installed. They wanted me to install it! Come on... it's 2017 and they're playing "blame the browser!" I refused and ended the chat session.
I've cleared cache. I've cleared cookies. No avail.
Anyone else having problems using Firefox on Windows 7 x64?