Whenever I hear the 'mythical legend of the 10X rockstar developer', I think of them. Mozilla needs more of those developers to reproduce AND send patches to interesting bugs like this. Not the whining copypasta forum-posting 'users' calling themselves 'developers' who take many open-source projects like this for granted and don't appreciate the time spent by the maintainers of the project.
Nowadays they're usually doing this on a developer social network through every maintainers nightmare 'The Issues Tab'.