Examine source code of Jumping Fox Logo DarkMode

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Fox_bounce_darkmode",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(43, 42, 51, 0.65)",
      "toolbar_text": "rgb(251, 251, 254)",
      "frame": "rgb(28, 27, 33)",
      "tab_background_text": "rgb(251, 251, 254)",
      "toolbar_field": "rgb(30, 30, 36)",
      "toolbar_field_text": "rgb(251, 251, 254)",
      "tab_line": "rgb(49, 50, 53)",
      "popup": "rgb(66, 65, 77)",
      "popup_text": "rgb(251, 251, 254)",
      "toolbar_field_focus": "rgb(66, 65, 77)",
      "tab_loading": "rgb(49, 50, 53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42011bbd-7587-4786-aa72-926b2609d791}"
    }
  }
}