Stash and Pop - Private sessions by Incognito

This is an extension that allows you to stash and pop a private browsing window.
The intended use is if you have to upgrade Firefox or restart your Computer you do not want to lose your private browser session. It goes without saying, this can fly in the face of the concept "Private Browsing" if misused.

Click the extension icon in your toolbar in a private window to stash or pop.
Stash: store current private window and its tabs to local storage obfuscated and closes the window.
Pop: restores the stashed tabs in the currently open private window. Cleans the stash.

Preferences
Auto-Flush: Set to invalidate the stash after x hours on pop. Set to "-1" to keep the stash indefinitely. It will be kept in localstorage obfuscated until popped/deleted. So this is no Mission-Impossible-Exploding-Sunglasses.