Examine source code of j4yTHEME

{
  "name": "j4yTHEME",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "0287d3ba8b3330fca99f69e2001d3168.gif"
    },
    "colors": {
      "frame": "rgba(0, 1, 10, 0.65)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 1, 10, 0.65)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 1, 10, 0.65)",
      "tab_line": "rgba(255, 65, 81, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a756d767-91c7-4621-9a82-f5fd04928c76}"
    }
  }
}