Examine source code of TARDIS Fox

{
  "theme": {
    "images": {
      "theme_frame": "test2.png"
    },
    "colors": {
      "frame": "#0000ff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "TARDIS Fox",
  "manifest_version": 2,
  "description": "Tardisfox icon made by ~jokermask @ devianArt. Hope he likes the persona."
}