" ... This Firefox extension detects one very specific type of memory leak in chrome JavaScript and in Web pages. (Not in JavaScript components, though.) It detects when JavaScript objects in the chrome or Web page are still held by native code after the window is closed. It notifies the user after the first full garbage collection (i.e., cycle collection) after the window has been closed, so that the user is most likely to be able to correlate the notification with the action that caused it. ... "