After using it for months/years, I lost a whole lot of unrecoverable tabs.
With no warnings at all, yesterday it deleted all my tabs information and now I can't recover it :(
To quote another user: "Second time I am losing a whole lot of unrecoverable tabs.
And usually when I don't like something I just uninstall and move on with my life. But this time is different.
I feel like I have to WARN people because OneTab fails to do so. If you have a sub-par extension, either fix it(automatically backup? support recovery?), take it down or include a Disclaimer that your extension should be used only for casual usage.

Because anyone who actually wants to keep their sh*t should definitely STEER AWAY from this extension."