Examine source code of Test Alignment Grid

{
  "theme": {
    "images": {
      "theme_frame": "Grid_Header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Test Alignment Grid",
  "manifest_version": 2,
  "description": "This Persona is for testing purposes.  Since the header area size can vary depending on the set-up, this 10 pixel square grid should help Persona developers to better judge the size and placement of Persona images."
}