In the Service Now platform there is a feature that emulates users. Is there a one in Dynamics 365 ? As of now, I am opening multiple tabs in different browsers to test user apps/forms/solutions.
No out of the box feature for this.
Couple of ideas;
Use Firefox in conjunction with Multi-Account Containers. This allows you to effectively have multiple active sessions for different users open within a single browser. This might be easier to manage.
Use a single user, but write code to automate the switching of security roles. This way you can rapidly switch between different user roles.