What's this orange "Work" with briefcase icon in Firefox?
I've used Firefox for approximately 10 years, but I've never seen this before! Please see below.
I was working under the premise (very unlikely true, but still) that interacting with that icon would do nothing at all and then the asker could be justified in asking the question. And since searching "Firefox work icon" also didn't return anything... All in all, the benefit of the doubt, and thus I'm giving VLDR the chance to respond before voting.
Quasimodo's comment is correct. Nothing happens when I hover or click it. Googling "Firefox work icon" returned nothing.