Examine source code of Tabby by M♥Donna

{
  "name": "Tabby by M♥Donna",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Tabby.jpg"
    },
    "colors": {
      "frame": "rgba(75, 65, 46, 1)",
      "tab_background_text": "rgba(235, 230, 230, 1)",
      "toolbar": "rgba(74, 79, 33, 0)",
      "bookmark_text": "rgba(235, 230, 230, 1)",
      "toolbar_field": "rgba(74, 79, 33, 0.06)",
      "toolbar_field_text": "rgba(235, 230, 230, 1)",
      "tab_line": "rgba(235, 230, 230, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{575a12e7-6bba-4d90-9199-d464d2b9f779}"
    }
  }
}