The e-mail seems to suggest that it would improve performance. >Because XUL and XBL aren’t web technologies, they don’t get the same platform attention that HT

The e-mail seems to suggest that it would improve performance. >Because XUL and XBL aren’t web technologies, they don’t get the same platform attention that HTML does (for good reason!). Performance problems go unfixed and it creates a lot of unnecessary complexity within Gecko. It’s harder for even experienced web developers to get up to speed. It’s further from the web, and that doesn’t help anybody.