AppSuite:Memory leaks (UI)
Intro: Searching for memory leaks in the UI is not a pleasant task, but sadly necessary.
Different browsers offer different ways of tracing memory leaks. As of writing, the core team's favourite browser is Google Chrome.
Addy Osmani has written extensively on finding memory leaks with Chrome. His often-quoted article "Taming the Unicorn" explains how to use the Chrome DevTools for this purpose.