They mentioned what browser is permitted to access the login. There's nothing Firefox forum users can do to help if the institutions chooses to do what they do.

''<p>Mike Gerard [[#question-1476107|said]]</p>'' <blockquote>My connection to the Swiss bank UBS.COM is refused for connection to my account. UBS says it is a Firefox problem, because it accepts a Chrome connection! </blockquote> We have no idea what that means because you have failed to show the issue. Screenshots would help us help you. What OS? What version of Firefox? Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf Did you clear your browser cache? https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox Try to clear all items for a single site. https://support.mozilla.org/en-US/kb/remove-websites-address-bar-suggestions