Developer reply by Infocatcher
Rated 5 out of 5 stars
I really like this addon, used to use it on Opera v12 or below. Anyway I got an issue when using it with Tab Mix Plus. It doesn't add closed tab list even when on Private Window which usually do.
This review is for a previous version of the add-on (0.1.7.1.1-signed).> It doesn't add closed tab list even when on Private Window which usually do.
Thanks for report, will be fixed in the next release:
https://github.com/Infocatcher/Private_Tab/issues/145
P.S. This is issue with built-in Firefox session mechanism, so the same happens without Tab Mix Plus.
To create your own collections, you must have a Mozilla Add-ons account.