From http://www.w3schools.com (Copyright Refsnes Data)

XSLT Browsers

All major browsers have support for XML and XSLT.

Mozilla Firefox

Firefox 3 supports XML, XSLT, and XPath.

Internet Explorer

Internet Explorer 6 supports XML, XSLT, and XPath.

Internet Explorer 5 is NOT compatible with the official W3C XSL Recommendation.

Google Chrome

Chrome 1 supports XML, XSLT, and XPath.

Opera

Opera 9 supports XML, XSLT, and XPath. Opera 8 supports only XML + CSS.

Apple Safari

Safari 3 supports XML and XSLT.

From http://www.w3schools.com (Copyright Refsnes Data)