Examine source code of YellownGreen

{
  "name": "Yellow and Green",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Desktop_01.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(128, 255, 0, 0.3)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(238, 255, 0, 1)",
      "toolbar_field_text": "rgba(136, 255, 0, 1)",
      "tab_line": "rgba(136, 255, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb86904e-ed57-4e6c-bc80-b862ee9167f4}"
    }
  }
}