ORIGINAL: OneTab is without question, the absolute best extension I have found for Firefox. If I could only have ONE extension, I would pick this one. This extension is SO helpful! I especially like that you have provided a way to export/import the data so it will never be lost. Thank you so much! It is SO helpful to me that I would rate it at 10 stars, if I could! So generous of you to share it.
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I came back today to make a donation because OneTab is a lifeline for me. It is some of the best system design, programming, and documentation I have seen - and I was an IT professional before I retired. Congratulations for a bang-up job, guys. Work of this quality should be rewarded.
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I don't really understand some of the reviews about losing data. I do my own backups. I just copy/paste the lot into a wordpad.rtf file (using your export feature), which is saved in a folder that is backed up with my data drive (my system is on a separate drive). It is dead easy to restore to OneTab.

Now that you have all these new features, I will have to revise my backup strategy, since there are now many control fields that must be considered (groups, pins, etc.), to get everything back in original format.

Thank you so much for sharing this with us.
Grateful in North Carolina,
AnneF

p.s. What is the reason OneTab doesn't display in Private Windows? It does save tabs, it just doesn't display there - it calls up a standard window instance.