Examine source code of Firepower

{
  "theme": {
    "images": {
      "theme_frame": "ff-persona-cut.png"
    },
    "colors": {
      "frame": "#edf5f9",
      "tab_background_text": "#1e1e1e"
    }
  },
  "version": "2.0",
  "name": "Firepower",
  "manifest_version": 2,
  "description": "Repeating guns pattern, designed to match the UI"
}