Firefox ESR in Debian12, won't start. 140.12.0esr (64-bit)

This is the entirety of the log message.

    [chrome-demo] chrome assets + engine wasm ready
    [gecko] warning: unsupported syscall: __syscall_madvise
    [gecko] embed-xul: main() on the app pthread (PROXY_TO_PTHREAD)
    [gecko] embed-xul: GECKO_GL_PASSTHROUGH=0
    [gecko] embed-xul: GECKO_COARSE_CLOCK=1
    [gecko] [libxul] abort: Assertion failed
    [gecko] Aborted(Assertion failed)