This article is also available in:
Krisp speaker not shown in some apps [Firefox only]

Firefox has an issue with some of the web applications, such as Google Meet, as the browser does not allow any speaker to be selected other than default. 

As Krisp cannot be selected as a default speaker, a solution that might work for you is to use another browser for calls with Krisp if you have encountered such an issue. This is a very browser specific issue and it's solution depends on Firefox and the web application (Google Meet) handling the case better.
Was this article helpful?
Thank you!