Examine source code of plainBlack

{
  "theme": {
    "images": {
      "theme_frame": "plainBlackHead.jpg"
    },
    "colors": {
      "frame": "#bababa",
      "tab_background_text": "#fcfcfc"
    }
  },
  "version": "2.0",
  "name": "plainBlack",
  "manifest_version": 2,
  "description": "A plain black Persona with light grey text colour and a slightly darker grey as accent colour."
}