Examine source code of Cupertino: Unofficial macOS theme for Firefox

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Cupertino: Unofficial macOS theme for Firefox",
  "short_name": "Cupertino",
  "author": "Corbin Davenport",
  "description": "A Firefox theme designed to match the macOS color scheme and design.",
  "homepage_url": "https://github.com/corbindavenport/cupertino",
  "icons": {
    "32": "img/icon_x32.png",
    "64": "img/icon_x64.png",
    "128": "img/icon_x128.png",
    "256": "img/icon_x256.png"
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "img/light_frame_right.svg",
        "img/light_frame_left.svg",
        "img/light_frame_center.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "left top",
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat"
      ]
    },
    "colors": {
      "frame": "rgb(236, 236, 236)",
      "frame_inactive": "rgb(250, 250, 250)",
      "toolbar_field": "rgb(250, 250, 250, 97%)",
      "toolbar_field_border": "rgb(250, 250, 250, 97%)",
      "toolbar_text": "rgb(74, 74, 74)",
      "toolbar_field_text": "rgb(74, 74, 74)",
      "toolbar_top_separator": "rgb(242, 242, 242)",
      "toolbar_bottom_separator": "rgb(236, 236, 236)",
      "tab_selected": "rgb(250, 250, 250)",
      "tab_text": "rgb(74, 74, 74)",
      "tab_line": "rgb(218, 218, 218)",
      "tab_background_text": "rgb(74, 74, 74)",
      "tab_background_text_inactive": "rgb(190, 190, 190)",
      "sidebar": "rgb(250, 250, 250)",
      "sidebar_text": "rgb(74, 74, 74)",
      "sidebar_border": "rgb(250, 250, 250)",
      "popup": "rgb(250, 250, 250, 97%)",
      "popup_text": "rgb(74, 74, 74)",
      "popup_highlight": "rgb(44, 146, 251)",
      "popup_border": "rgb(195, 192, 190)",
      "button_background_hover": "rgb(236, 236, 236)",
      "button_background_active": "rgb(223, 223, 223)",
      "ntp_background": "rgb(250, 250, 250)"
    }
  },
  "dark_theme": {
    "images": {
      "additional_backgrounds": []
    },
    "colors": {
      "frame": "rgb(30, 30, 30)",
      "frame_inactive": "rgb(30, 30, 30)",
      "toolbar": "rgb(30, 30, 30)",
      "toolbar_field": "rgb(23, 23, 24, 97%)",
      "toolbar_field_border": "rgb(37, 37, 37)",
      "toolbar_text": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(30, 30, 30)",
      "toolbar_bottom_separator": "rgb(30, 30, 30)",
      "tab_selected": "rgb(57, 57, 57)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(30, 30, 30)",
      "tab_background_text": "rgb(234, 234, 234)",
      "tab_background_text_inactive": "rgb(234, 234, 234)",
      "sidebar": "rgb(23, 23, 24)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar_border": "rgb(30, 30, 30)",
      "popup": "rgb(37, 37, 37, 97%)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(44, 146, 251)",
      "popup_border": "rgb(91, 91, 91)",
      "button_background_hover": "rgb(48, 48, 48)",
      "button_background_active": "rgb(57, 57, 57)",
      "ntp_background": "rgb(38, 54, 57)",
      "ntp_card_background": "rgb(23, 23, 24)",
      "ntp_text": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11cafadf-e9ef-4dc6-8fc4-26649a14799f}"
    }
  }
}