Examine source code of Blood Raven

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Blood Raven",
  "manifest_version": 2,
  "description": "It's a dark sky with a red moon and some white friggin ravens.\n\nYou know what... They say that Red and Black is quite beautiful together. I think so too."
}