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That Stack Overflow answer is poorly worded though, looking at an outer stack frame is really nothing like going back in time. Going back in time in the Firefox Replay sense means reversing execution of the program, e.g. to find the values of variables that have been mutated or gone out of scope.

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But that's what drop frame does - it goes back to the state before your current function call, including resetting variables. It does not revert global state (like static variables) but it is essentially like reverting execution 95% of the times I use it.

It doesn’t really ”go back”, it just shows a different stack frame, which is part of the current state of the program.

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