Notification preferences do not load on a Firefox browser.
Steps to Reproduce
From a Firefox browser, log in to a base system Helsinki instance.
Impersonate a user, such as Beth Anglin. (In the banner frame, click on your name and select Impersonate User.)
Click on the user's name and select Profile from the drop-down menu.
Under the Related Links section, click Notification Preferences.
Note that the page is blank and notifications are not displayed.
Use a different browser such as Chrome. The page will appear correctly.
To receive notifications when more information is available, subscribe to this Known Error article by clicking the Subscribe button at the top right of the article. If you are able to upgrade, review the Fixed In field to determine whether any versions have a permanent fix.
Related Problem: PRB718569