The problem may be that Firefox did not close properly.

Do you get any kind of error message?

http://kb.mozillazine.org/Issues_with_Firefox

http://kb.mozillazine.org/Firefox.exe_always_open

I do not get any error messages. I ran Sophos virus scan on my entire computer with no viruses detected. I do not play online games, I do not open attachments from emails I did not initiate. I can get Safari to load every time; I do not like Safari, which is why I use Firefox.

Start your Computer in safe mode with networking. Then start Firefox. Try Safe web sites. Is the problem still there?

Starting The Computer In Safe Mode;
Free Online Encyclopedia

Type about:support in the address bar and press Enter. Under the main banner, press the button; Copy Text To Clipboard.. Then in the reply box at the bottom of this page, do a right click in the box and select Paste. This will show us your system details. No Personal Information Is Collected.

See if anything here can help;

http://www.bing.com/search?q=firefox+not+close

Did you check in the activity (process) monitor if Firefox isn't running?

• http://kb.mozillazine.org/Kill_application

• "Firefox hangs when you quit it": https://support.mozilla.org/kb/Firefox+hangs
• "Hang at exit": http://kb.mozillazine.org/Firefox_hangs

I tried a Force Quit on Firefox. Noticed the little dot under the Firefox icon disappeared. So I then clicked on the Firefox icon and it jumped up and down. Viola! I can now engage Firefox without restarting my computer. So does that mean Firefox was not quitting on its own? And why did that start all of a sudden. Inquiring minds. So with this I seem to be okay once again. How bizarre.

Do you what that dot was for? Where it came from?

If it should come back, try to take a snap shot. Safe Surfing.