Safari and Chrome: Microsoft 365 is designed to work with the current version of the Safari and Chrome browsers.
Microsoft Edge: Microsoft 365 is designed to work with the latest version of the Microsoft Edge browser. Microsoft 365 might continue to work with older versions of the Microsoft Edge Legacy browser, but Microsoft can’t provide any guarantees.
Firefox: Most Microsoft 365 apps are designed to work with the current version of Firefox. However, Firefox does not fully support Microsoft Teams meetings.
Microsoft Teams meetings are fully supported on the latest versions of Microsoft Edge and Google Chrome. For more details on browser support for Teams meetings, see Limits and specifications for Microsoft Teams: Browsers.
via: Microsoft System Requirements