[PLUG] Firefox security issue?

[Rich Shepard]

Just tried to log on to my bank and they said because of security issues
they no longer allow use of firefox. They offered three alternatives: M$
edge, Chrome, or ... mozilla-firefox.

A) As far as I recall it's always been mozilla-firefox (but they wouldn't
let me long in using it) and 
2) What's the security flaw? I've seen nothing on ArsTechnica or
KrebsOnSecury about this.

Any ideas?

Rich