Entra ID Master Key (EIDMK) is a free Chrome add-on developed by Harckade. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory. This extension allows users to bypass Microsoft Entra ID (previously Azure Active Directory) restrictions and access information that is typically only available through CLI or other applications.

By tricking the web browser into sending legitimate requests to Microsoft endpoints, EIDMK enables users to retrieve data that they already have access to but cannot access through the Entra ID portal UI. It is important to note that this extension does not grant any new permissions or change the user's roles, privileges, or permissions. It simply provides an alternative method to retrieve data that is already accessible through other means.

EIDMK is particularly useful for security professionals who need a quick solution to analyze Microsoft Entra ID tenants. With this extension, users can expect to access the same features and information that they can access through Graph API, CLI, or PowerShell. This includes listing all groups, retrieving user information, accessing application registrations, enterprise applications, devices, and even creating new tenants (subject to the user having an active Azure subscription and organization settings permitting).

Please note that this extension requires the user to be a user of the specific tenant in order to view its content.