Examine source code of Matte Black

{
  "manifest_version": 2,
  "author": "Utsav Oza",
  "version": "3.0.0",
  "name": "Matte Black",
  "description": "A dark theme with matte defaults.",
  "icons": {
    "16": "icon.svg",
    "32": "icon.svg",
    "48": "icon.svg",
    "64": "icon.svg",
    "96": "icon.svg"
  },
  "theme": {
    "colors": {
      "frame": "rgba(24, 25, 28, 1)",
      "frame_inactive": "rgba(30, 31, 34, 1)",
      "tab_text": "rgba(235, 235, 235, 1)",
      "tab_background_text": "rgba(170, 170, 170, 1)",
      "tab_line": "rgba(10, 11, 14, 0.50)",
      "tab_loading": "rgba(64, 65, 68, 1)",
      "tab_selected": "rgba(64, 65, 68, 1)",
      "toolbar": "rgba(48, 49, 52, 1)",
      "toolbar_top_separator": "rgba(48, 49, 52, 1)",
      "toolbar_bottom_separator": "rgba(30, 31, 34, 1)",
      "toolbar_vertical_separator": "rgba(48, 49, 52, 1)",
      "toolbar_field": "rgba(30, 31, 34, 1)",
      "toolbar_field_text": "rgba(235, 236, 239, 1)",
      "toolbar_field_border": "rgba(30, 31, 34, 1)",
      "toolbar_field_focus": "rgba(30, 31, 34, 1)",
      "toolbar_field_border_focus": "rgba(28, 143, 164, 0.95)",
      "button_background_hover": "rgba(255, 255, 255, 0.12)",
      "button_background_active": "rgba(255, 255, 255, 0.15)",
      "icons": "rgba(235, 236, 239, 1)",
      "bookmark_text": "rgba(235, 236, 239, 1)",
      "popup": "rgba(41, 42, 45, 1)",
      "popup_text": "rgba(235, 236, 239, 1)",
      "popup_border": "rgba(20, 21, 24, 0.50)",
      "popup_highlight": "rgba(48, 49, 52, 1)",
      "popup_highlight_text": "rgba(235, 235, 235, 1)",
      "ntp_background": "rgba(48, 49, 52, 1)",
      "ntp_text": "rgba(240, 240, 240, 1)",
      "sidebar": "rgba(53, 54, 58, 1)",
      "sidebar_text": "rgba(235, 236, 239, 1)",
      "sidebar_border": "rgba(41, 42, 45, 1)",
      "sidebar_highlight": "rgba(41, 42, 45, 1)",
      "sidebar_highlight_text": "rgba(235, 236, 239, 1)"
    }
  }
}