radare2 lets you take snapshots of memory and registers and restore them, but it doesn't let you, say, record the entire execution of multi-process Firefox from

radare2 lets you take snapshots of memory and registers and restore them, but it doesn't let you, say, record the entire execution of multi-process Firefox from startup to shutdown and later replay that perfectly. It's not capturing the effects of the environment that you need to make that work.