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The answer by Tivac is basically correct. When the page unloads (i.e. you visit a new URL), all the memory for the page is cleaned up. Or it should be. Regardless, it stops being your concern whether the memory for a page remains allocated after the unload event has fired.

That said, if you're replacing content in the DOM dynamically in any way, you need to make sure to detach any event handlers you might have created on those parts of the DOM. Generally, pages aren't long-lived enough for this to be an issue unless you're attaching horrific numbers of event handlers.