Examine source code of Beautiful Red Blur

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "BeautifulRedBlur@Godie"
    }
  },
  "version": "1.3",
  "name": "Beautiful Red Blur",
  "author": "GODIE",
  "description": "Tema Al Estilo Blur Para Firefox. Contiene Css Personalizado.",
  "icons": {
    "32": "images/icon-32.png"
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/blur.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ],
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    },
    "colors": {
      "frame": "hsla(272, 60%, 4.90%, 1)",
      "tab_background_text": "hsla(0, 0%, 80%, 1)",
      "frame_inactive": "hsla(265.71, 18.92%, 7.25%, 1)",
      "toolbar": "hsla(272, 24.59%, 11.96%, .72)",
      "toolbar_text": "hsla(0, 0%, 70.20%, 1)",
      "toolbar_field": "transparent",
      "toolbar_field_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_top_separator": "hsla(0.58, 100%, 59.41%, .26)",
      "toolbar_bottom_separator": "hsla(272, 45.45%, 6.47%, 1)",
      "bookmark_text": "hsla(0, 0%, 82.75%, 1)",
      "toolbar_field_border": "hsla(271.30, 56.10%, 8.04%, 0)",
      "toolbar_field_focus": "hsla(257.50, 23.53%, 20%, .99)",
      "toolbar_field_border_focus": "transparent",
      "toolbar_field_highlight": "hsla(0.58, 100%, 59.41%, .86)",
      "toolbar_field_highlight_text": "hsla(0, 0%, 87.06%, 1)",
      "toolbar_field_text_focus": "hsla(240, 1.96%, 90%, 1)",
      "toolbar_vertical_separator": "hsla(272.31, 23.21%, 21.96%, 1)",
      "button_background_hover": "hsla(308.57, 9.25%, 55.49%, .28)",
      "button_background_active": "hsla(272, 51.72%, 5.69%, .73)",
      "icons": "hsla(240, 1.30%, 84.90%, 1)",
      "icons_attention": "hsla(359.42, 100%, 59.41%, 1)",
      "ntp_background": "hsla(272.31, 25.49%, 10%, 1)",
      "ntp_text": "hsla(240, 1.96%, 90%, 1)",
      "ntp_card_background": "hsla(270, 13.33%, 17.65%, 1)",
      "popup": "hsla(272.31, 25.49%, 10%, .98)",
      "popup_text": "hsla(240, 1.96%, 90%, 1)",
      "popup_border": "hsla(0, 0%, 0%, .62)",
      "popup_highlight": "hsla(0.58, 100%, 59.41%, .86)",
      "sidebar": "hsla(272.31, 25.49%, 10%, 1)",
      "sidebar_text": "hsla(202.50, 10%, 84.31%, 1)",
      "sidebar_border": "hsla(188.57, 46.67%, 2.94%, 1)",
      "sidebar_highlight": "hsla(272.31, 39.39%, 6.47%, 1)",
      "sidebar_highlight_text": "hsla(0.59, 100%, 60.39%, 1)",
      "tab_line": "hsla(0.38, 100%, 59.41%, .66)",
      "tab_loading": "hsla(0.58, 100%, 59.41%, .86)",
      "tab_loading_inactive": "hsla(0.58, 100%, 59.41%, .86)",
      "tab_background_separator": "hsla(260, 14.29%, 4.12%, 1)",
      "tab_selected": "hsla(272, 24.59%, 11.96%, .72)",
      "tab_text": "hsla(0, 0%, 100%, 1)",
      "tab_attention_dot": "hsla(0.58, 100%, 59.41%, .86)"
    }
  }
}