Examine source code of Mountain Canvas

{
  "theme": {
    "images": {
      "theme_frame": "lake-canvas-blur-header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Mountain Canvas",
  "manifest_version": 2,
  "description": "This is an image of the mountain range that sweeps above Lake Barbellino in the Alps. I've added some blur to dull it's detail and added a canvas layer on top as well."
}