Examine source code of A Summer's Day

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#f5e98b",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "A Summer's Day",
  "manifest_version": 2,
  "description": "A bright, sunny theme reminiscent of a warm summer's day. Features pretty colours that are easy on the eyes."
}