I’ve signed in but can’t see my emails because there’s all kinds of advanced search details where the emails should be.

My email was working perfectly until a few days ago.  When I logged on, rather than seeing my new emails, there is a line of typed stuff which seems to be related to advanced search.  I didn't even know there was an advanced search so can't see that this could be my fault.  I can however, get my emails through Google.  This problem is in using Firefox.