I think you are affected by malware. It's a third party issue not a problem of Firefox. So first press Ctrl+Shift+a from your keyboard. This will open your Add-ons manager. Uninstall add-ons you don't need. I can see from your details that you have installed Mindspark Toolbar Platform Plugin Stub for 32-bit Windows and FilmFanatic Installer Plugin Stub for 32-bit Windows. Try to remove them and see what happened next. I hope you will find your solution. If not run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner, which are specialised in adware and browser hijackers.

Let me explain more thoroughly. On the Mozilla face page just below where one logs in, there was a statement allowing Whimsical by mjkelly. There were a bunch of little things one could add on to the face page. I chose Moon Forget which was a person holding an umbrella in the rain. This now appears up at the top of my page automatically. I saw somewhere an explanation where I was to click on the three parallel lines at the top right which would drop down a box thus allowing me to choose Add-Ons. I lost it thereafter as to how to eliminate the whimsical add-on called moon forget. That is my problem. Thanks for your efforts however.

I finally figured it out and eliminated the problem. Thanks for your kind attempt.