Examine source code of Graphite Grace: Refined

{
  "manifest_version": 2,
  "version": "1.2.3",
  "name": "Graphite Grace: Refined",
  "description": "A modern graphite Firefox theme with subtle blue accents and layered dark surfaces.",
  "author": "Matt",
  "homepage_url": "https://github.com/00mtboylan/graphite-grace-refined",
  "icons": {
    "32": "images/icon.svg",
    "64": "images/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "graphite-grace-refined@mboylan.github.io",
      "strict_min_version": "115.0"
    }
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/theme_frame.jpg",
        "images/bg-overlay.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ],
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    },
    "colors": {
      "frame": "#2F2F2F",
      "frame_inactive": "#292929",
      "toolbar": "#2F2F2F",
      "toolbar_text": "#EEEEEE",
      "bookmark_text": "#EEEEEE",
      "tab_background_text": "#B4B4B4",
      "tab_background_separator": "rgba(255,255,255,.08)",
      "tab_text": "#EEEEEE",
      "tab_selected": "#2F2F2F",
      "tab_line": "rgba(105,178,255,0.6)",
      "tab_loading": "rgba(105,178,255,0.5)",
      "toolbar_field": "#222222",
      "toolbar_field_text": "#EEEEEE",
      "toolbar_field_focus": "#222222",
      "toolbar_field_text_focus": "#EEEEEE",
      "toolbar_field_border": "#484848",
      "toolbar_field_border_focus": "rgba(105,178,255,0.6)",
      "toolbar_field_highlight": "rgba(105,178,255,0.6)",
      "toolbar_field_highlight_text": "#FFFFFF",
      "toolbar_top_separator": "rgba(105,178,255,0.6)",
      "toolbar_bottom_separator": "transparent",
      "toolbar_vertical_separator": "#484848",
      "icons": "#EEEEEE",
      "icons_attention": "#7EC2FF",
      "button_background_hover": "rgba(105,178,255,.10)",
      "button_background_active": "rgba(105,178,255,0.20)",
      "popup": "#262626",
      "popup_text": "#EEEEEE",
      "popup_border": "#484848",
      "popup_highlight": "rgba(105,178,255,0.6)",
      "popup_highlight_text": "#FFFFFF",
      "sidebar": "#2F2F2F",
      "sidebar_text": "#EEEEEE",
      "sidebar_border": "#484848",
      "sidebar_highlight": "rgba(105,178,255,0.6)",
      "sidebar_highlight_text": "#FFFFFF",
      "ntp_background": "#2F2F2F",
      "ntp_card_background": "#3A3A3A",
      "ntp_text": "#EEEEEE"
    }
  }
}