changing browsers in deja monitors

Good morning,

How do you change the browser in the actual monitor?  I originally did the monitor in Chrome but received an error 84.  I redid the monitor but that didn't help.  When I redid it in FF that did work but every time I loaded it, the browser defaulted back to Chrome.  How do you change the browser and keep it at the new browser setting when recording in DeJa.

thanks so much,

Priscilla