Examine source code of MasterWok

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "MasterWok",
  "manifest_version": 2,
  "description": "Another chilled out theme, to cool you down on a hot summers day. Bottom bar is pretty cool to if you like using the add-on bar in firefox.\nEnjoy ...."
}