User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b4) Gecko/20050803 Firefox/1.0+ Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b4) Gecko/20050803 Firefox/1.0+ A change in theme can affect how a page is presented. For example, the atom feed for Mozilla.org will show a button or a very thin line under "Article Length", depending on the theme. Reproducible: Always Steps to Reproduce: 1. Set Theme as default 2. Go to http://www.mozillazine.org/atom.xml 3. Set theme to SphereGnome Actual Results: Instead of a button, a thin vertical line appears under "article length". Expected Results: A button should appear under "Article Length", regardless of theme choice. For a discussion, see the Mozillazine Forum topic Theme Changes sinces 1.0, from here: http://forums.mozillazine.org/viewtopic.php?p=1650748#1650748 sharebird's screenshot is here: http://img34.imageshack.us/img34/4730/feedview7rz.th.png my theme's screenshot is here: http://www.pshrink.com/firebird/Atom-SG.png

Feedview (like error pages) is themeable, by design. Also, it relies on the theme widgets (buttons, textbox, etc.) look & feel, that also applies to xul sliders.