Examine source code of Johnny Test

{
  "name": "Johnny Test Header for FF",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Johnny Test Header for FF.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 0.86)",
      "tab_background_text": "rgba(84, 219, 21, 0.55)",
      "toolbar": "rgba(245, 218, 14, 0.16)",
      "bookmark_text": "rgba(255, 255, 255, 0.7)",
      "toolbar_field": "rgba(215, 250, 40, 0.25)",
      "toolbar_field_text": "rgba(255, 255, 5, 0.64)"
    }
  }
}