[BUG] Slack: This browser is no longer supported

When opening Slack, it says: This browser is no longer supported
We know it's a hassle to switch browsers, but we want your experience of Slack to be fast, secure, and the best it can possibly be. To continue, please switch to a supported browser, or — for the finest Slack experience — download the desktop app

I hope its just a matter of the user agent string, is it possible for this issue to be fixed?