I have sucessfully set up a load testing environment for Jitsi Meet using Jitsi Meet torture based on this tutorial.
Since the Chrome Driver is giving us troubles, I would like to switch to using Firefox on the nodes. I have provided the Gecko Driver and the sample node is displaying its Firefox capability on the hub.
Now when I launch a test run using the Malleus script, all users try to use Chrome and the output during startup says
 No participant type specified for prefix: web.participant1, will use Chrome...  No participant type specified for prefix: web.participant2, will use Chrome...
How can I force Malleus to use Firefox, e.g. by specifying a participant profile? I cannot see any option to do that in the script. Any hint is appreciated.