Xml pages won't load using latest Firefox 7, worked fine in earlier versions

A web app that loads and displays xml files using javascript and xsl stylesheets is breaking since upgrading to Firefox 7.
These pages load successfully using Firefox 3 and 4, and all versions of IE.
I can't figure out why, bit it breaks when returning to pages that have already been successfully loaded.
Error console shows:
"Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIDOMXMLDocument.load] ... data: no"
but this is occurring for a file that had been successfully loaded previously.
Additional info:
I am getting the following warning for pages that do load successfully:
Warning: Use of Document.load() is deprecated. To upgrade your code, use the DOM XMLHttpRequest object.
I know I will need to deal with this issue sometime in the near future, but the structure of the data means that I need to load stylesheets from a directory above the directory containing the xml data being loaded, and the security features of XMLHttpRequest won't allow this. So a move to using XMLHttpRequest means restructuring the data, which is a major overhaul.

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The helpers at that forum are more knowledgeable about web development issues.<br />
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See http://forums.mozillazine.org/viewforum.php?f=25

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Xml pages won't load using latest Firefox 7, worked fine in earlier versions

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