Examine source code of Elemental – Balanced

{
  "manifest_version": 2,
  "name": "Elemental – Balanced",
  "author": "Mozilla",
  "version": "2.1",
  "icons": {
    "32": "icon.svg"
  },
  "theme": {
    "colors": {
      "tab_background_text": "hsl(0, 0%, 100%)",
      "tab_text": "hsl(0, 0%, 0%)",
      "tab_selected": "hsl(40, 7%, 92%)",
      "tab_line": "transparent",
      "tab_loading": "hsl(40, 7%, 18%)",
      "frame": "hsl(38, 7%, 30%)",
      "popup": "hsl(0, 0%, 100%)",
      "popup_text": "hsl(0, 0%, 0%)",
      "popup_border": "hsl(43, 7%, 60%)",
      "popup_highlight": "hsla(40, 7%, 55%, 0.4)",
      "popup_highlight_text": "hsl(0, 0%, 0%)",
      "toolbar": "hsl(43, 7%, 40%)",
      "toolbar_text": "hsl(0, 0%, 100%)",
      "toolbar_field": "hsl(40, 7%, 92%)",
      "toolbar_field_text": "hsl(0, 0%, 0%)",
      "toolbar_field_focus": "hsl(0, 0%, 100%)",
      "toolbar_field_border_focus": "rgba(0, 179, 244, 1)",
      "toolbar_top_separator": "transparent",
      "toolbar_bottom_separator": "hsl(38, 7%, 30%)",
      "ntp_background": "hsl(42, 8%, 78%)",
      "ntp_card_background": "hsl(0, 0%, 100%)",
      "ntp_text": "hsl(0, 0%, 0%)",
      "sidebar": "hsl(0, 0%, 100%)",
      "sidebar_text": "hsl(0, 0%, 0%)",
      "sidebar_highlight": "hsla(40, 7%, 55%, 0.4)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "elemental-balanced-colorway@mozilla.org"
    }
  }
}