There are a couple of reason you might want to develop in a different browser or computer:
1. If you are publishing a screen update or running a process that takes a while, then Method is pretty much unresponsive in other tabs of the same browser until the publishing or long process finishes.
2. If there are multiple people at a company that do customization work, they would use the same email address to log in. They wouldn't be in the same account at the same time, but they might be in 2 different accounts with the same sign-in email address.
~ Method user / partner since 2008
~ Over 15 years field service experience
~ 2013 Method Partner of the Year
~ Degree in Computer Science