Fix a Firefox problem when mouse-scrolling in the contents sidebar.
When the entire Contents list does not fit in the sidebar, you can scroll it with the mouse. However, if you hit the bottom of the sidebar, the scroll effect jumps to the main frame. This can cause the main frame to switch to a new topic relative to the Contents list. The result of changing the Contents topic now being displayed causes the highlight in the Contents sidebar to switch to the new topic. That, in turn, causes the sidebar to scroll to display the newly highlighted item. Thus a topic at the bottom of the Contents sidebar may no longer be accessible. But the objective of scrolling the sidebar was to get to that item near the bottom, not to scroll the main window. So this is a frustrating effect.
I note that this problem does not arise with Chrome. That is because the scrolling effect does not automatically switch to the main frame, when you hit the bottom of the sidebar. I hope there is a way to fix this in Firefox, as I normally use Firefox.
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David Vanderschel commented
Please note that this problem has yet to be fixed.