Examine source code of Red Pentagrams

{
  "theme": {
    "images": {
      "theme_frame": "RedPentagramsH1.jpg"
    },
    "colors": {
      "frame": "#c95f5f",
      "tab_background_text": "#f2a7a7"
    }
  },
  "version": "2.0",
  "name": "Red Pentagrams",
  "manifest_version": 2,
  "description": "Red Pentagrams fading to black, and vice versa."
}