Examine source code of Meadow 4K

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#3b3b3b"
    }
  },
  "version": "2.0",
  "name": "Meadow 4K",
  "manifest_version": 2,
  "description": "Meadow 4K • A meadow of high grass. \n• The Firefox Theme 'Meadow' is (c) 2017 by Band1to. \n- All Rights Reserved."
}