Given that it requires a complete rewrite of how XSLT works in Firefox, that the rewrite would make the XSLT much slower, and that the use cases for XSLT on the

Given that it requires a complete rewrite of how XSLT works in Firefox, that the rewrite would make the XSLT much slower, and that the use cases for XSLT on the web that actually want this feature are few and far between, the chances of this happening are low.