Examine source code of Tigris

{
  "theme": {
    "images": {
      "theme_frame": "tigrisheader.jpg"
    },
    "colors": {
      "frame": "#0d0d0c",
      "tab_background_text": "#ffefde"
    }
  },
  "version": "2.0",
  "name": "Tigris",
  "manifest_version": 2,
  "description": "Header with tiger-skin texture."
}