I just tried the Beta version of the "Questions" page, and have noticed a fairly straightforward bug with keyboard navigation and scrolling.
I use keyboard navigation a lot, but the up arrow, down arrow, page up and page down keys are initially broken -- I can't use them to scroll down in the list of questions.
I think the problem here is that you have two separate scrolling panels -- the question panel and that other panel thing on the left. Because I need to use large fonts, the other panel also gets a scrollbar, and so Firefox doesn't know which one to scroll.
Please don't break such basic keyboard navigation features. For those of us who have multiple accessibility issues it's important for them to work in a standard way.

https://beta.stackoverflow.com/questionsin the URL bar. 3) Press the down arrow key. The "questions" panel should scroll down, but does not.