Examine source code of Forest Glow

{
  "theme": {
    "images": {
      "theme_frame": "_AFirefox.jpg"
    },
    "colors": {
      "frame": "#6e2506",
      "tab_background_text": "#97370e"
    }
  },
  "version": "2.0",
  "name": "Forest Glow",
  "manifest_version": 2,
  "description": "Landscape of the sun seen through the silhouettes of trees in a forest in Winter.\n(I do not claim to own this image, I just think its an brilliant image)"
}