Examine source code of Lightbulb

{
  "name": "Lightbulb",
  "version": "1.2",
  "manifest_version": 2,
  "theme": {
    "colors": {
      "button_background_hover": "rgba(56, 64, 84, 0.5)",
      "frame": "rgb(18, 23, 34)",
      "popup": "rgb(48, 54, 71)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "popup_text": "rgb(184, 195, 208)",
      "sidebar_text": "rgba(160, 176, 217, 0.2)",
      "tab_background_text": "rgb(119, 135, 162)",
      "tab_line": "rgba(160, 176, 217, 0)",
      "tab_loading": "rgba(160, 176, 217, 0)",
      "tab_selected": "rgba(160, 176, 217, 0)",
      "tab_text": "rgb(255, 207, 111)",
      "toolbar": "rgb(29, 35, 49)",
      "toolbar_bottom_separator": "rgba(112, 127, 154, 0)",
      "toolbar_field": "rgb(44, 53, 72)",
      "toolbar_field_focus": "rgb(46, 52, 68)",
      "toolbar_field_highlight": "rgb(54, 91, 255)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(226, 232, 250)",
      "toolbar_text": "rgb(120, 132, 151)",
      "toolbar_vertical_separator": "rgba(112, 127, 154, 0.5)"
    },
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d97fc7b8-e01e-42b9-97b7-12453b13d48e}"
    }
  }
}