How to have safari use XSLT translation

Some time ago I created a number of XML files with schema and XSLT for translation to HTML.

The XML file begins with:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>

<?xml-stylesheet type="text/xsl" href="../recipe2html.xsl"?>

<recipe xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="../recipe.xsd">

This no longer seems top work. All I get is a blank file. Asking Safari to debug this, the error is:

Unsafe attempt to load URL file:///Users/.../recipes/Data/recipe2html.xsl from origin null. Domains, protocols and ports must match.

Obviously this is some sort of new security feature. However, I fail to see any "mis-match" since everything is local on the same machine. Clearly this rule is being applied in an over-zealous manner that fully disables the Sar=fari support of XSLT.

How can I disable this?