Examine source code of Foxista-A

{
  "theme": {
    "images": {
      "theme_frame": "vista_header.jpg"
    },
    "colors": {
      "frame": "#05818a",
      "tab_background_text": "#d9fff8"
    }
  },
  "version": "2.0",
  "name": "Foxista-A",
  "manifest_version": 2,
  "description": "Apply Your Vista Theme Into Firefox..."
}