Developer reply by Infocatcher
Rated 3 out of 5 stars
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?
This review is for a previous version of the add-on (0.2.1.2). This user has 2 previous reviews of this add-on.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. :(
To create your own collections, you must have a Mozilla Add-ons account.