Tried this on a fresh profile. Very stupid behaviors:
- Click the OneTab button, it will close all tabs, thus the name OneTab. But I usually just want to stash one or several tabs, not all. To achieve this, I must right click. Very annoying.
- When you open a session, it will load all the tabs at the same time. NO! They should be in dicarded state, and load on demand.

So my conclusion is, I will not use this addon.