Customize the Header of Feed Previews when you open a Feed using Firefox's built-in subscribe page.

See the before and after screenshots to see what preview page I mean!

Features:
+ Header image will be a faded Firefox logo with shadowing
+ Supports a huge list of Fonts (discussed below)
+ Image supplied in default code is hard-coded - allowing you to view the background, even when offline!
+ Background image is static and is centered on the window.
= Optional - Font size of the popup will be larger (must uncomment)
= Optional - Bold text for easier readability (must un-comment)

Fonts Supplied (Supported):
- Currently, I supplied the following Fonts in the Code:
1. Segoe UI (User Interface of Vista)
2. Calibri (Text of Vista)
3. Verdana (XP Font)
4. Helvetica (XP)
5. Tahoma (XP User Interface Default Font)
6. Arial Global Font

Applies to:
+ RSS Feed View Preview Page
+ Live Bookmarks Subscribe screen
+ Works on RSS, Atom, XML, NetVibes, ATOM, JSON, CSV, YAML