Examine source code of superblack_mozila

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "superblack_mozila",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(56, 56, 56)",
      "icons": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 0, 0)",
      "sidebar_border": "rgb(0, 0, 0)",
      "tab_selected": "rgb(56, 56, 56)",
      "toolbar_field_border_focus": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{84c9a30e-7f3a-49e3-9f5a-a5f2ec48d52a}"
    }
  }
}