Examine source code of L_in_the_rain

{
  "theme": {
    "images": {
      "theme_frame": "L-in-the-rain.jpg"
    },
    "colors": {
      "frame": "#1c0f0f",
      "tab_background_text": "#0d0404"
    }
  },
  "version": "2.0",
  "name": "L_in_the_rain",
  "manifest_version": 2,
  "description": "L"
}