The page does not use frames. It does use a lot of CSS, including a scrolling sidebar.
Is there a CSS tweak I could use to fix this? I'm using the Stylish add-on to override a few other annoyances and could add in a fix if possible.
Why is FireFox behaving like this?
FWIW, I did check to see if I'd activated caret browsing. The behavior noted occurs with caret browsing off.