def METHOD_NAME(self):
    """List all defined extensions."""
    result = []
    for extname, extdef in list(self.extensions.items()):
        if not extdef["show"]:
            continue
        infos = self.get_extension_infos(extname)
        infos["id"] = extname
        result += [infos]
    return sorted(result, key=lambda i: i["name"])