User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729) Try opening svgz file. An XML error is reported. This file works fine in Opera, Chrome, and IE w/Adobe SVG plug-in. Reproducible: Always Steps to Reproduce: 1.Open file 2. 3. Actual Results: XML Parsing Error: not well-formed Location: file:///C:/Test/svgB/SVGZ/test2.svgz Line Number 1, Column 1: Expected Results: Should display a square. From SVG spec: http://www.w3.org/TR/SVG11/intro.html "1.2 SVG MIME type, file name extension and Macintosh file type The MIME type for SVG is "image/svg+xml" (see [RFC3023]). The registration of this MIME type is in progress at the W3C. It is recommended that SVG files have the extension ".svg" (all lowercase) on all platforms. It is recommended that gzip-compressed SVG files have the extension ".svgz" (all lowercase) on all platforms."