Examine source code of Silver on a Cliff

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#1c3357"
    }
  },
  "version": "2.0",
  "name": "Silver on a Cliff",
  "manifest_version": 2,
  "description": "Silver from Pokemon, art from Pixiv, some parts are repainted by me."
}