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First thing's first: after a morning spent debugging the issue, I found this extension kills the site icons from all browser tabs except internal ones (like Options and Add-ons) on Firefox 50.

The basic functionality is nice. No need to tie a temporary session to a whole another window. It would be nice to be able to pin a private tab with a starting URL so that it would remain across sessions.

Это отзыв для предыдущей версии этого дополнения (0.1.9.1). 

See https://github.com/Infocatcher/Private_Tab/issues/224
Fixed version already released, but not yet reviewed:
https://addons.mozilla.org/addon/private-tab/versions/0.2.0