Examine source code of Derby - Purple

{
  "theme": {
    "images": {
      "theme_frame": "purpleskatefirefox.jpg"
    },
    "colors": {
      "frame": "#a965af",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Derby - Purple",
  "manifest_version": 2,
  "description": "The \"Roller Derby Red\" persona originally uploaded by \"sandburchick\", redone in purple to represent my roller derby league's colors!"
}