Examine source code of Meter stick

{
  "theme": {
    "images": {
      "theme_frame": "Meterruler.png"
    },
    "colors": {
      "frame": "#0011ff",
      "tab_background_text": "#0011ff"
    }
  },
  "version": "2.0",
  "name": "Meter stick",
  "manifest_version": 2,
  "description": "This is a Meter stick. This is mostly for a test."
}