Examine source code of FoxLegend

{
  "theme": {
    "images": {
      "theme_frame": "HeaderSmall.png"
    },
    "colors": {
      "frame": "#262626",
      "tab_background_text": "#696969"
    }
  },
  "version": "2.0",
  "name": "FoxLegend",
  "manifest_version": 2,
  "description": "It's a relatively basic Persona inspired by Firefox itself, I made it as a bit of fun."
}