background
i wasn't sure if i should post it here or in bug report section, but i'm using the beta version so..
i'm using the stylish extension ( https://addons.mozilla.org/pl/firefox/addon/2108 ) with about:blank blue firefox userstyle ( http://userstyles.org/styles/1761 ) which changes the background in a blank tab. the thing is, it also seems to change the background of pages in 'old page/new page/changes' view (not in current page)
see screenshot of xkcd.com in 'changes' view:
http://img398.imageshack.us/my.php?image=screen1fl2.png
and in 'current page' (normal) view:
http://img161.imageshack.us/my.php?image=screen2xb1.png
the issue disappears when i turn of the userstyle, and it's not a big one, but well, it does look weird when i have a big firefox icon in the background of a not-exactly-firefox-related site.
==edit==
i KNOW xkcd has an rss feed. but i like updatescanner more, at least for pages that do work with it properly (ones without comments on main page, for instance).
Re: background
See the comments on the about:blank userstyle page ( http://userstyles.org/styles/1761 ) - this problem occurs whenever an empty frame is created and loaded with data. This is because the frame retains the url "about:blank" after data is written to it - this is not a bug, just the way firefox works. You'll see this behaviour with gmail and other web2.0 sites.
See the comments on http://userstyles.org/styles/1761 for more details, and workaround recommendations.