Examine source code of Developer/Coders

{
  "name": "Developer",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "20170819_204717.jpg"
    },
    "colors": {
      "toolbar": "rgba(196, 186, 186, 1)",
      "toolbar_field": "rgba(48, 46, 46, 1)",
      "toolbar_field_text": "rgba(247, 237, 237, 1)",
      "frame": "rgba(209, 217, 235, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(23, 20, 20, 1)"
    }
  }
}