Стиль добавляет иконку "incognito mode" из GNOME Web.
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| Скриншот приватного окна с применённым юзерстилем |
Код юзерстиля (применить можно, например, с помощью
Stylish):
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
@-moz-document url("chrome://browser/content/browser.xul") {
#main-window[privatebrowsingmode=temporary] #TabsToolbar {
background-image: url(data:image/png;base64,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) !important;
background-repeat: no-repeat !important;
background-position: top -24px right 14px !important;
}
}