[suchow]

This pitch is already strong, but is actually improved by the suggestion (inspired by your comment) to cut it to half its previous length:

"Setting up a dev environment takes a day. Sometimes you need one in a minute, like if you're interviewing somebody and need them to demonstrate coding ability on a company laptop. We turn any browser window into a fully-functional dev environment, and it's as ephemeral as the browser window is, so if you close it the company laptop is back in its original state without requiring a sysadmin to wipe it..."

[chc]

Well, the second part is just responding to an anticipated first question.