Examine source code of Gemini Nightshade

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gemini Nightshade",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(37, 37, 37)",
      "toolbar_text": "rgb(141, 141, 141)",
      "frame": "rgb(56, 56, 56)",
      "tab_background_text": "rgb(160, 155, 155)",
      "toolbar_field": "rgb(82, 81, 80)",
      "toolbar_field_text": "rgb(207, 204, 207)",
      "tab_line": "rgb(117, 116, 118)",
      "popup": "rgb(46, 46, 47)",
      "popup_text": "rgb(173, 170, 173)",
      "tab_loading": "rgb(117, 116, 118)"
    }
  }
}