Examine source code of Abstract_Firefox

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_LABS.jpg"
    },
    "colors": {
      "frame": "#d6d6d6",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Abstract_Firefox",
  "manifest_version": 2,
  "description": "My first design, I hope you like it;)\n\nby Life_Design"
}