Mozilla Firefox 48.0.2 on Mac OS X
Logged into today and saw that the favicon has changed to a narrow capital P. At first I thought I was on the wrong site.
Then I noticed that whenever I click on a thread title on the main page or on the list page of each sub-forum, instead of taking me to the most recent post (or close to it) it takes me to the middle of the page. Not the top, not the bottom, but somewhere roughly in the middle.
The worst issue: if I click on the "Reply" button on a thread, instead of showing me the form at the top, it takes me straight to the bottom of the page and I have to scroll all the way up to the form.