Walmart.com and Cyberfox x64 AMD lockup

For some reason today when I go to walmart.com and click on the down arrow to search only in a category it locks Cyberfox AMD 64 bit. I have to kill it in Task Manager. I notice there was a similar thing posted about Firefox back in 2013.

Firefox Portable 32 bit has no issue. I tried backing off Cyberfox to 34.01 and it still locks up.

Is anyone else running into this?

I tried it for Walmart.com and Walmart.ca in IE11 and had no lockups, my processor is Intel though.

It seems to be a Cyberfox thing. Opera x64 and chromium work. There is a delay when clicking the down arrow. But CF just locks up. Weird.