Scrolling on a sly frame has no effect in Firefox versions 18 or lower, scrolling just scrolls the page and not the frame, from version 19 upwards it works, if I find the reason I'll do a PR...
First thought it's maybe something with my own implementation, then tested your examples (only the horizontal one for FF >= 3.6.8, but in 3.6.8 also vertical doesn't work) and had the same issue.
Dragging the frame (grab with mouse and move) works though...
Scrolling on a sly frame has no effect in Firefox versions 18 or lower, scrolling just scrolls the page and not the frame, from version 19 upwards it works, if I find the reason I'll do a PR...
First thought it's maybe something with my own implementation, then tested your examples (only the horizontal one for FF >= 3.6.8, but in 3.6.8 also vertical doesn't work) and had the same issue.
Dragging the frame (grab with mouse and move) works though...