What are some alternatives?
When comparing Session Box and OneTab, you can also consider the following products
Tabs Outliner - Next Generation Session, Windows, Tabs Manager and a TooManyTabs Solution That Really Works.
Session Buddy - Manage Your Browser Sessions
Firefox Multi-account Containers - Sign in to two different accounts on the same site
Workona - A better way to work in the browser.
Multiloginapp - Connect to websites as a multitude of different users
Toby - Better Than Bookmarks