Examine source code of VJTI Quad 3D_grey

{
  "theme": {
    "images": {
      "theme_frame": "gray_VJTI_mozilla_personawin1_basic.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "VJTI Quad 3D_grey",
  "manifest_version": 2,
  "description": "This is another VJTI persona with 3D effects in grey color. The visibility of the tabs has been improved from the previous versions."
}