Firefox gets fix for evil cursor attack

The bug is a classic "evil cursor" attack and works because modern browsers allow site owners to modify how the mouse cursor looks while users are navigating their websites.

For example, mouse cursors can be defined to be as large as 256 pixels in width and height. An evil cursor attack is when a regular mouse cursor is shown in the top-left corner, but the click spot is defined in the bottom-right corner, to create a huge discrepancy between where the user sees the cursor and where the actual click is.