User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007 Firebird/0.7 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031007 Firebird/0.7 When I load a page displaying XML, click the middle mouse button (so that the circular scrolling indicator appears) and move the mouse up and down to scroll, as soon as I click the rendering of the XML code changes and no longer displays a document tree. Reproducible: Always Steps to Reproduce: 1. Load an XML file without a stylesheet. 2. Click the middle mouse button so that the up and down scrolling arrows appear. Actual Results: The rendering of the page changed, and it no longer displayed as XML with the document tree. Expected Results: Continue displaying the document tree and allow the user to scroll.

*** This bug has been marked as a duplicate of 215762 ***

verified dupe.