Examine source code of Dark Space Improved

{
  "manifest_version": 2,
  "version": "1.1.1",
  "default_locale": "en",
  "name": "Dark Space Improved",
  "description": "Dark space theme, improved to make active tab + text more visibile. Inspired by https://addons.mozilla.org/en-GB/firefox/addon/nicothin-space/",
  "author": "Matthew Winfield",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "89.0"
    }
  },
  "theme": {
    "images": {
      "additional_backgrounds": [
        "img/background.gif"
      ]
    },
    "properties": {
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "button_background_active": "#333333",
      "button_background_hover": "#282828",
      "bookmark_text": "rgba(255, 255, 255, 0.9)",
      "frame": "#000000",
      "frame_inactive": "#000000",
      "icons": "rgba(255, 255, 255, 0.9)",
      "icons_attention": "#9400ff",
      "ntp_background": "#000000",
      "ntp_text": "rgba(255, 255, 255, 0.9)",
      "popup": "#101010",
      "popup_border": "#303030",
      "popup_highlight": "#303030",
      "popup_highlight_text": "white",
      "popup_text": "rgba(255, 255, 255, 0.9)",
      "sidebar": "#101010",
      "sidebar_border": "#303030",
      "sidebar_highlight": "#303030",
      "sidebar_highlight_text": "white",
      "sidebar_text": "rgba(255, 255, 255, 0.9)",
      "tab_background_separator": "rgba(255, 255, 255, 0.2)",
      "tab_background_text": "#aaaaaa",
      "tab_line": "rgba(255, 255, 255, 0.25)",
      "tab_loading": "white",
      "tab_selected": "rgba(200, 200, 200, 0.1)",
      "tab_text": "#ffffff",
      "toolbar": "rgba(25, 25, 25, 0.8)",
      "toolbar_bottom_separator": "#101010",
      "toolbar_field": "#000000",
      "toolbar_field_border": "transparent",
      "toolbar_field_border_focus": "#303030",
      "toolbar_field_focus": "#111111",
      "toolbar_field_highlight": "#333333",
      "toolbar_field_highlight_text": "white",
      "toolbar_field_text": "rgba(255, 255, 255, 0.9)",
      "toolbar_field_text_focus": "white",
      "toolbar_top_separator": "rgba(200, 200, 200, 0.1)",
      "toolbar_vertical_separator": "rgba(255, 255, 255, 0.1)"
    }
  }
}