I've pinged HQ about this.... stand by - it was moved for some technical reasons but should be back Dave W7UUU
Over the summer, I discovered that you can take the weekly quiz without limitations (same questions) if you are not logged in, and keep trying until you get the right answers. Then when you log in, you can take the quiz and using the info from not being logged in, score 100%. HEY-O!
On the home page, go to the Resources tab and it's near the bottom, "Ham Radio Trivia Quiz"... Glad I wasn't the only one lost without it...
I see it just fine using Firefox, in List View it's on the top right and in Grid View it's further down in the middle right. Never lost it.