Examine source code of Michigan Tech shadow

{
  "theme": {
    "images": {
      "theme_frame": "mtu_gray_header_small_shadow_offset2.png"
    },
    "colors": {
      "frame": "#c9c9c9",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Michigan Tech shadow",
  "manifest_version": 2,
  "description": "Michigan Tech logo w/ drop shadow on plain gray background.  Not intrusive, not particularly distracting."
}