Firefox Multi-Account Containers

Firefox Multi-Account Containers allow you to isolate your browsing activity into separate, color-coded categories. This enables you to stay logged into the same website with different accounts simultaneously in the same browser window without needing multiple profiles and is especially useful when testing users wih different permissions. The extension can be installed as Firefox Browser Add-On.

After installation you can create containers, configure different names or colors and use each container as an isolated profile to test different user accounts without having multiple browser profiles or browser windows.