Examine source code of Serious Characters

{
  "theme": {
    "images": {
      "theme_frame": "Topbanner.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#0573f2"
    }
  },
  "version": "2.0",
  "name": "Serious Characters",
  "manifest_version": 2,
  "description": "My First. Despite the odd preview, it actual is fairly good looking banner."
}