Examine source code of Blue Hat

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Blue Hat",
  "manifest_version": 2,
  "description": "This is a photo i captured while enjoying a hot coffee in a cozy place somewhere in Thessaloniki. The subject is my black-n-white, striped hat which i photographed against the light coming outside of the window. The blue colour is ot an effect of photoshop but a \"play\" with volour balance mode. Hope you like it!"
}