It hasn't happened to me since r8919 so if you are reporting a re-occurrence please include the mafia version and some details about what is happening. The problem I may have solved was unreleated to a browser and could be triggered by opening multiple KoLmafia windows simultaneously and trying to interact with all of them.
For those running Windows, when you say "it happened" do you mean Windows actually labeled KoLmafia as "unresponsive"?
For those running Windows, when you say "it happened" do you mean Windows actually labeled KoLmafia as "unresponsive"?