[Plugin: WordPress SEO by Yoast] Sitemap stylesheet issues with Firefox 13.0

I’m using WordPress SEO 1.1.9 with WordPress 3.3.2. My sitemaps (https://unlikelyexplanations.com/sitemap_index.xml and the sitemaps that it points to) look fine when I view them in Safari or Chrome, but when I view them in Firefox (13.0 on a Mac), I get this:

Error loading stylesheet: An unknown error has occurred (80004004)

https://unlikelyexplanations.com/wp-content/plugins/wordpress-seo/css/xml-sitemap-xsl.php

I’m guessing that robots ignore stylesheets, so this probably won’t cause any real problems, but I thought I’d mention it because it made me think my sitemaps were broken earlier today.

Laura

P.S. I saw the other thread regarding sitemaps and stylesheets, but I think this is an entirely different issue, since the error codes are different and there are no redirects involved in my requests.

https://www.ads-software.com/extend/plugins/wordpress-seo/