Examine source code of Sky-like Abstract

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#4ed4c9",
      "tab_background_text": "#245ac7"
    }
  },
  "version": "2.0",
  "name": "Sky-like Abstract",
  "manifest_version": 2,
  "description": "This theme consists of blues that blend together. The curving brighter blue is mellowed out by the softer blue in the background."
}