When I go into my portfolios, I can see the individual stocks but the tabs don't work (like data, dividends, etc.
Not sure, I checked your account with the latest version of Firefox and it worked fine. My Firefox just updated itself to version 69, but you are still on version 56 which is 2 years old already.
If this problem persists, I suggest that you first update your browser and try to disable any plug-ins to see if that might be affecting the site, Good luck.
Customer support service by UserEcho