Examine source code of Clean Grey Theme

{
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "cleangreytheme@yeet.com",
      "strict_min_version": "100.0"
    }
  },
  "version": "1.0",
  "name": "Clean Grey Theme",
  "theme": {
    "colors": {
      "frame": "#444444",
      "tab_background_text": "#FFFFFF",
      "toolbar": "#ECECF2",
      "bookmark_text": "#111111",
      "tab_background_separator": "#111111",
      "tab_selected": "#ECECF2",
      "tab_text": "#111111",
      "tab_line": "#000000",
      "toolbar_field": "#F4F4FA",
      "toolbar_field_border": "#D0D0D0",
      "toolbar_field_border_focus": "#6A8FE3",
      "toolbar_field_text": "#111111",
      "toolbar_field_highlight": "#6A8FE3",
      "toolbar_field_highlight_text": "#FFFFFF",
      "toolbar_top_separator": "#444444",
      "ntp_background": "#ECECF2",
      "ntp_text": "#111111",
      "popup": "#ECECF2",
      "popup_text": "#111111",
      "popup_highlight": "#6A8FE3",
      "popup_highlight_text": "#FFFFFF",
      "sidebar": "#ECECF2",
      "sidebar_text": "#111111",
      "sidebar_highlight": "#6A8FE3",
      "sidebar_highlight_text": "#FFFFFF"
    }
  }
}