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You can just hit F8 and the debugger will pause at the next instruction. Works in both Chrome/FF.

Neither the bookmarklet or F8 is ideal if you want to retain focus and any other state that you may effect by going and clicking or pressing a key.

F8 first causes focus to be lost from the document body. Just tested in Chrome.

Woah, “Emulate a focused page” is a great tip, too.