You should probably seek direction from your internal IT team, as they will determine which browser(s) they will support in your organization going forward. From BP's perspective, all of the browsers are supported since version 6.8, but keep in mind that specific versions of BP are evaluated against specific versions of the browsers. It's recommended to match up the BP version to the browser version that it was tested against.
The list of BP versions and browser versions can be found here:
https://bpdocs.blueprism.com/bp-6-9/en-us/Guides/chrome-firefox/chrome-firefox.htm------------------------------
James Man
Professional Services
Blue Prism
Asia/Hong_Kong
------------------------------