[BRANDING] Private Window display modified 'Nightly' logo.

As per trademark policy put forword by Mozilla[1];

Don’t modify Mozilla’s trademarks, abbreviate them, or combine them with any other symbols, words, or images, or incorporate them into a tagline or slogan.

Current Private Window of Abrowser (And in that case, IceCat?) is actually using a modified Firefox Nightly logo[2] (Please find the attached screenshot.), thus violating Mozilla's trademark policy. In fact, previous versions used similarly modified Firefox logos in Private Window of Abrowser.

Kindly comply by making necessary changes in source code to include a customized logo in Private Window and to avoid further conflicts in future.

References:-

[1] https://www.mozilla.org/en-US/foundation/trademarks/policy/
[2] https://www.mozilla.org/en-US/foundation/trademarks/list/