Need to be able to identify whether a window is private, and we should be able to make private windows the default rather than a chosen exception.
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Hello
https://connect.mozilla.org/t5/discussions/private-windows-would-best-always-look-like-private-windo... if you want to try the preference browser.privatebrowsing.resetPBM.enabled
Configuration Editor for Firefox https://support.mozilla.org/en-US/kb/about-config-editor-firefox
never-displayed