Examine source code of Midnight - A better dark theme for Firefox

{
  "name": "Midnight - A better dark theme for Firefox.",
  "author": "Zander Leitzke",
  "manifest_version": 2,
  "version": "1.4.1",
  "theme": {
    "colors": {
      "frame": "rgba(0, 0, 0)",
      "frame_inactive": "rgb(0, 0, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(250, 250, 250)",
      "tab_loading": "rgb(250, 250, 250)",
      "icons_attention": "rgb(0, 221, 255)",
      "tab_selected": "rgb(37, 37, 41)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "toolbar": "rgb(37, 37, 41)",
      "toolbar_top_separator": "rgb(37, 37, 41)",
      "toolbar_bottom_separator": "rgb(37, 37, 41)",
      "toolbar_vertical_separator": "rgb(250, 250, 250)",
      "toolbar_field": "rgb(17, 17, 20)",
      "toolbar_field_text": "rgb(250, 250, 250)",
      "toolbar_field_border": "rgb(17, 17, 20)",
      "toolbar_field_focus": "rgb(47, 47, 52)",
      "toolbar_field_border_focus": "rgb(47, 47, 52)",
      "button_background_hover": "rgba(200, 200, 200, 0.12)",
      "button_background_active": "rgba(255, 255, 255, 0.15)",
      "icons": "rgb(250, 250, 250)",
      "bookmark_text": "rgb(250, 250, 250)",
      "popup": "rgb(37, 37, 41)",
      "popup_text": "rgb(250, 250, 250)",
      "popup_border": "rgb(37, 37, 41)",
      "popup_highlight": "rgba(200, 200, 200, 0.12)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(17, 17, 20)",
      "ntp_text": "rgb(250, 250, 250)",
      "sidebar": "rgb(37, 37, 41)",
      "sidebar_text": "rgb(250, 250, 250)",
      "sidebar_border": "rgb(17, 17, 20)",
      "sidebar_highlight": "rgba(200, 200, 200, 0.12)",
      "sidebar_highlight_text": "rgb(170, 170, 170)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c7b838fb-507d-4192-b674-0f75ec107c79}"
    }
  }
}