> Key Bank won't let me login using Firefox unless I spoof my user agent
Stop encouraging this behavior and cancel your service, then.
> Also, ADP (timesheets and paycheck system) frequently breaks for Firefox. Sometimes it just won't load any of its forms or grids when I'm using Firefox. I think they only test with Chrome.
Was the last time you checked like 10 years ago? Haven't seen this happen in quite some time.