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The Private Tab extension used to work well... until I updated Firefox to version 52.0 (64-bit). Now, if I have a bookmark with "private:" prefixed to the URL -- e.g. "private:https://addons.mozilla.org/" -- the bookmark no longer works at all. Are other people seeing this too?

Ta opinia jest o wcześniejszej wersji dodatku (0.2.1.2).  Ten użytkownik wystawił dla tego dodatku także 2 inne opinie.

See https://github.com/Infocatcher/Private_Tab/issues/251
So, Firefox developers decided to fix possible crash in such way... and now we have tricks for "toggle private state" feature and some not implemented/updetad things. :(