Examine source code of Red Night Alone

{
  "manifest_version": 3,
  "version": "1.0",
  "name": "Red Night Alone",
  "description": "A dark horror theme with red elements for Firefox",
  "author": "LaneZero",
  "homepage_url": "https://github.com/LaneZero",
  "theme": {
    "images": {
      "theme_frame": "images/bg.png",
      "additional_backgrounds": [
        "images/bg.png",
        "images/pattern.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x",
        "repeat"
      ],
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    },
    "colors": {
      "frame": "rgb(50, 0, 0)",
      "tab_background_text": "rgb(255, 150, 150)",
      "tab_background_text_inactive": "rgb(200, 120, 120)",
      "tab_text": "rgb(255, 150, 150)",
      "tab_selected": "rgba(80, 0, 0, 0.8)",
      "toolbar": "rgba(15, 0, 0, 0.95)",
      "toolbar_text": "rgb(255, 80, 80)",
      "toolbar_field": "rgba(0, 0, 0, 0.85)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(120, 0, 0)",
      "toolbar_field_focus": "rgba(60, 0, 0, 0.9)",
      "toolbar_field_border_focus": "rgb(200, 50, 50)",
      "tab_line": "rgb(200, 0, 0)",
      "tab_loading": "rgb(255, 100, 100)",
      "button_background_hover": "rgba(120, 0, 0, 0.4)",
      "button_background_active": "rgba(180, 0, 0, 0.6)",
      "popup": "rgb(25, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(120, 0, 0)",
      "popup_highlight": "rgb(100, 0, 0)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(15, 0, 0)",
      "ntp_card_background": "rgba(60, 0, 0, 0.8)",
      "ntp_text": "rgb(255, 200, 200)",
      "sidebar": "rgb(30, 0, 0)",
      "sidebar_text": "rgb(255, 200, 200)",
      "sidebar_border": "rgb(100, 0, 0)",
      "sidebar_highlight": "rgb(120, 0, 0)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "icons": "rgb(255, 150, 150)",
      "icons_attention": "rgb(255, 80, 80)",
      "bookmark_text": "rgb(255, 200, 200)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6a0d31f-8c43-4d2f-b15f-7e7c7c88f8de}",
      "strict_min_version": "115.0"
    }
  }
}