Examine source code of DarkReverse

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "DarkReverse",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 20, 20)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(50, 50, 50)",
      "tab_background_text": "rgb(161, 161, 161)",
      "toolbar_field": "rgb(50, 50, 50)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(100, 100, 100)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgba(255, 255, 255, 0)",
      "toolbar_field_border": "rgb(100, 100, 100)",
      "toolbar_field_focus": "rgb(50, 50, 50)",
      "tab_loading": "rgb(100, 100, 100)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e301ea3-ca65-4cac-9db9-6cb7372a2c58}"
    }
  }
}