Customize the Body 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!

** Code is based on Daniel Ritchie (Honestly Illustrated)@userstyles's similar painted black - Firefox RSS feed handler.

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)
= Optional - Remove the Horizontal Rule just below the feed description (must uncomment)

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 F