Security error when clicking on profile after you log in

I was reading through forums (on Firefox), logged in to click like, and then clicked on the avatar to get the poster's profile and got a pop up with the following message:
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The following error occurred:

Security error occurred. Please press back, refresh the page, and try again.
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By closing the page and reopening it I was able to open it without any issue but it seems there may be a bug with accessing profiles if you open the page and then log in.