Examine source code of 54AGE

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "54AGE",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(34, 57, 86)",
      "toolbar_text": "rgb(244, 244, 244)",
      "frame": "rgb(3, 27, 52)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(82, 82, 82)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(28, 46, 68)",
      "popup_text": "rgb(240, 240, 240)",
      "button_background_active": "rgb(0, 27, 47)",
      "button_background_hover": "rgb(105, 105, 105)",
      "icons": "rgb(96, 234, 255)",
      "tab_selected": "rgb(80, 99, 104)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce7c1d00-2630-4dc0-8b77-a0305c8c4772}"
    }
  }
}