It crashed for you? You must be running Arch Linux. ;-)

Arch Linux used system-provided SpiderMonkey which lacked a crucial bug fix. This issue should be solved by now, by Arch Linux switching back to vendored Spidermonkey.

Check out https://gitlab.archlinux.org/archlinux/packaging/packages/0a... and https://gitea.wildfiregames.com/0ad/0ad/issues/8757 for details.