Happily, Firefox was my default browser inside my registered Sandboxie...until I downloaded and installed Google Chrome.
Then Chrome became my default browser inside my Sandboxie. But inside Sandboxie/DefaultBox/Applications/WebBroser/Firfox, NOW Chrome shows under the Firefox tree.
So now, when I double-click the Sanboxie icon on my bottom task bar, it opens Chrome....NOT Firefox.
How do I revert my Sanboxie's default to Firefox, please?