Examine source code of Add (Elsword)

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#180066",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Add (Elsword)",
  "manifest_version": 2,
  "description": "I made a theme for Firefox featuring Add Diabolic Esper from Elsword made by Kog Games. I hope you enjoy the theme!"
}