Examine source code of Red Pokemon Pikachu

{
  "theme": {
    "images": {
      "theme_frame": "pokemonheader.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffff00"
    }
  },
  "version": "2.0",
  "name": "Red Pokemon Pikachu",
  "manifest_version": 2,
  "description": "Red to White gradient background, along with a small image of the Pokemon Logo and Pikachu.\nThis is my very first attempted and uploaded persona, so it may look a little basic and rubbish xP\n\nNote: I don't choose a specific accent colour, as I do not have a mac. If it looks a little blurred on your mac, I'm very sorry, but please mail me your suggested colour to change it to :)\n\nEnjoy ^.^"
}