Firefox Configuration

 

Launch your Firefox browser and enter "about:config" into the address bar. 

 

 

 

You will be brought to a page with a warning message. Click "I accept the risk" button to continue. 

 

 

You will see a page like this. 

 

 

Type "u2f" into the search bar and "security.webauth.u2f" will appear. Click and toggle the "Value" to "true".