https://addons.mozilla.org/en-US/firefox/addon/user-agent-string-switcher/

This didn't solve my problem. Still can't log in. https://wamt.myonlinechart.org/affiliate/Authentication/Login?action=status&errorNamespace=AuthError&errorKey=UnknownError Thanks for all your help. Jude

Hello, We're sorry to hear that the page doesn't work as expected. In order to look for the root cause, please follow the steps below and provide us with more information to troubleshoot your issue. # Please check if you have Enhanced Tracking Protection (ETP) enabled. You can do that by clicking the shield [[Image:Fx89ShieldIcon]] icon at the left of the address bar. #* If ETP is enabled, try disabling it. Does the problem persist? # If the problem is not fixed, try [[How to clear the Firefox cache | clearing Firefox cache]]. Does it help? # If it does not help, try also [[Clear cookies and site data in Firefox | clearing cookies and data]] for the website you experience troubles with (''warning: you will be logged out on this website''). Does it help? # If it also does not help, try [[Diagnose Firefox issues using Troubleshoot Mode | running Firefox in Troubleshoot Mode]]. Does the problem persist? # Finally, if the problem is still not fixed, please check if it persists in other browsers (e.g. Chrome, Edge, Opera or Safari). #* If it does, it is most likely an issue on the website's side. You may want to inform the website owner or administrator about that. #* If it doesn't, that's a compatibility issue. Please report it on [https://webcompat.com/issues/new Webcompat], so that our team there may be able to look into it. We'd also appreciate posting a link to your report here.