Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

Make sure you are not blocking content.

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/

https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection

Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}

There is a change in Firefox 96 related to cookies and insecure sites.

• https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/96#http

See also:

• /questions/1363998 blocked 3rd party cookies

As a workaround for now you can modify this pref on the about:config page to revert this change.

• about:config => network.cookie.sameSite.laxByDefault = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

I can log into John Hancock retirement now. By changing about:config => network.cookie.sameSite.laxByDefault = false but what does this open my browser to. any dangers that I need to be aware of

Websites need to adapt to modern security measures and send their requests to set cookies with the proper SameSite attribute. You can contact the website and point them to the SameSite article.

• https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite

Note: Lax replaced None as the default value in order to ensure that users have reasonably robust defense against some classes of cross-site request forgery (CSRF) attacks.