Examine source code of Optimus Prime Dark Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Optimus Prime Dark Them",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.77)",
      "toolbar_text": "rgb(255, 1, 55)",
      "frame": "rgb(70, 70, 70)",
      "tab_background_text": "rgb(209, 212, 212)",
      "toolbar_field": "rgb(150, 154, 154)",
      "toolbar_field_text": "rgb(0, 0, 4)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(146, 0, 1)",
      "popup_text": "rgb(198, 182, 185)",
      "button_background_active": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(127, 0, 0)",
      "frame_inactive": "rgb(173, 13, 13)",
      "icons_attention": "rgb(119, 119, 119)",
      "icons": "rgb(253, 0, 11)",
      "ntp_background": "rgb(180, 34, 37)",
      "popup_border": "rgb(198, 192, 192)",
      "popup_highlight": "rgb(232, 17, 17)",
      "sidebar_border": "rgb(255, 0, 4)",
      "sidebar_highlight_text": "rgb(222, 45, 48)",
      "sidebar_highlight": "rgb(241, 44, 44)",
      "sidebar_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8e172d9-711d-4941-94be-e74bd3a11e17}"
    }
  }
}