Can't log in to Google via Firefox

The problem occurs when a site refers users to a Google sign-in page. You enter your email, click the "Next" button, and nothing happens. This has been happening for at least the last 60 days. I see many complaints of this issue across various forums on the web. Additionally, within the same time frame, I've noted excessive 'clocking' and delayed screen response when accessing many sites via Firefox. Recently, I've had to resort to using Edge due to the number of sign-in issues and there's never an issue. Respectfully, please do not respond with, "Clear your cache" and other common suggestions. They don't work, I've already done it. This is a Firefox issue that needs correcting.