Great add-on! Does what it says, and I like what it does!
This add-on has been perfect in the three+ years in which I have been using it. The current/former problems it has had, did not stem from an issue with its makers, but an error on the part of Mozilla. Please consider editing or removing any negative reviews that have been added since the problem occurred, as the add-on has been updated in order to "fix" an issue, which in reality was not the OneTab makers' fault.
This is one of the best add-ons available for browsers, and it does not deserve to be trashed for one unintentional hiccup.