With e10s enabled, the mouse cursor is not updated when a new tab receives focus. To reproduce: 1. Open http://www.bing.com in a new tab. (Or any page with few elements.) 2. Open https://news.ycombinator.net in another tab. (Or any page with many links.) 3. With the YCombinator tab open, hover the cursor over a link. The cursor changes from an arrow to a hand. 4. Using the Alt key, switch to the open Bing tab. The cursor now incorrectly remains a hand until the mouse moves over an element that changes the cursor shape.