Examine source code of Material

{
  "name": "Material",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "material@firefox.themes.milaq",
      "strict_min_version": "67.0"
    }
  },
  "version": "1.0.1",
  "description": "Material Theme for Firefox",
  "theme": {
    "colors": {
      "frame": "#DEE1E6",
      "frame_inactive": "#E7EAED",
      "tab_text": "#202020",
      "tab_background_text": "#202020",
      "tab_background_separator": "#8B8E92",
      "tab_selected": "#FFFFFF",
      "tab_line": "#FFFFFF",
      "tab_loading": "#5F6368",
      "icons": "#5F6368",
      "icons_attention": "#000000",
      "toolbar": "#FFFFFF",
      "toolbar_top_separator": "#DEE1E6",
      "toolbar_bottom_separator": "#B6B4B6",
      "toolbar_vertical_separator": "#CED0D1",
      "toolbar_field": "#F1F3F4",
      "toolbar_field_focus": "#FFFFFF",
      "toolbar_field_text": "#202020",
      "toolbar_field_border": "#F1F3F4",
      "toolbar_field_border_focus": "#B3CEFB",
      "toolbar_field_separator": "#CED0D1",
      "toolbar_field_highlight": "#CAE2F9",
      "toolbar_field_highlight_text": "#202020",
      "popup": "#FFFFFF",
      "popup_text": "#202020",
      "popup_border": "#BABABA",
      "popup_highlight": "#F2F2F2",
      "popup_highlight_text": "#202020",
      "button_background_hover": "#EEEEEE",
      "button_background_active": "#E2E2E2",
      "bookmark_text": "#404040",
      "sidebar": "#FFFFFF",
      "sidebar_border": "#D8DADC",
      "sidebar_highlight": "#E8F0FE",
      "sidebar_text": "#202020",
      "sidebar_highlight_text": "#202020",
      "ntp_text": "#202020",
      "ntp_background": "#F7F7F7"
    }
  }
}