In a fast-moving world where things often need to happen quickly, multi-tasking has become more and more common. We constantly switch between tasks and try to keep our focus on all of them as much as possible. All modern web browsers support multitasking by offering multiple tabs in which we can work on different websites at the same time, and switch from one to another easily. You constantly see web developers having maybe 10 or more tabs open simultaneously, while the same applies to other types of individuals — like content editors.
Both developers and content editors frequently work on different environments of a website at the same time. Think of comparing content or configurations between environments, modifying content on a production environment, while troubleshooting issues in a staging environment. Basically, every task that might span multiple environments fits this need to keep focused on where things are actually happening.