EnvMate

About

EnvMate helps you quickly tell development, testing, staging, and production sites apart.

It detects the current environment from your URL rules and adds clear page markers such as badges or watermarks, so you are less likely to make mistakes on the wrong site. You can also save test accounts for each environment and fill them from the popup when needed.

Install EnvMate, add your environment rules in the options page, and it will start showing the current environment on matching pages.