Examine source code of Gray contrasted Concrete

{
  "theme": {
    "images": {
      "theme_frame": "grayheader.png"
    },
    "colors": {
      "frame": "#969191",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "Gray contrasted Concrete",
  "manifest_version": 2,
  "description": "concrete contrasted (gray)"
}