Can you post a screenshot of your menu bar on the right? I do not believe that should be a thing. Do you use custom user css or js?

Not sure what you mean by "switch between tabs locations". If you mean tabs on top/bottom, that has not been in the menu setting for 20-some versions, i think. You will need a userChrome.css file for that.

Hi, Thank you for your reply. I updated windows 10 and somehow the problem was fixed. It may have something to do with it, but I can't tell for sure. At least I'm glad to say it worked out. Thanks so much for willing to help. I appreciate it!

Well that was easy! :D Glad to hear it was all sorted out for you.

Thank you :)