Examine source code of Apollo Theme

{
  "manifest_version": 2,
  "version": "1.1.1",
  "name": "Apollo Theme",
  "description": "A high-contrast Firefox theme generated from the canonical Apollo palette.",
  "browser_specific_settings": {
    "gecko": {
      "id": "humble-apollo@d0n9x1n",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "theme": {
    "colors": {
      "frame": "#141617",
      "frame_inactive": "#141617",
      "tab_background_text": "#928374",
      "tab_selected": "#1d2021",
      "tab_text": "#cfbc97",
      "tab_line": "#fabd2f",
      "tab_loading": "#fabd2f",
      "tab_background_separator": "#3c3836",
      "toolbar": "#1d2021",
      "toolbar_text": "#cfbc97",
      "toolbar_field": "#141617",
      "toolbar_field_text": "#cfbc97",
      "toolbar_field_focus": "#1d2021",
      "toolbar_field_text_focus": "#d5c4a1",
      "toolbar_field_border_focus": "#fabd2f",
      "toolbar_field_separator": "#3c3836",
      "toolbar_vertical_separator": "#3c3836",
      "toolbar_field_highlight": "#3c3836",
      "toolbar_field_highlight_text": "#d5c4a1",
      "button_background_hover": "#3c3836",
      "button_background_active": "#665c54",
      "icons": "#cfbc97",
      "icons_attention": "#fabd2f",
      "ntp_background": "#141617",
      "ntp_text": "#cfbc97",
      "popup": "#1d2021",
      "popup_border": "#3c3836",
      "popup_highlight": "#3c3836",
      "popup_highlight_text": "#d5c4a1",
      "popup_text": "#cfbc97",
      "sidebar": "#1d2021",
      "sidebar_border": "#3c3836",
      "sidebar_highlight": "#3c3836",
      "sidebar_highlight_text": "#d5c4a1",
      "sidebar_text": "#cfbc97",
      "bookmark_text": "#cfbc97"
    }
  }
}