Examine source code of O-Review Shield

{
  "theme": {
    "images": {
      "theme_frame": "oreviewpersona1.png"
    },
    "colors": {
      "frame": "#4f4e4e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "O-Review Shield",
  "manifest_version": 2,
  "description": "Designed by request placed on one of my favourite websites"
}