hello, this sounds like a problem possibly caused by adware/malware on your pc. please go to firefox > addons > extensions & remove any suspicious entries (toolbars, things that you have not installed intentionally, don't know what purpose they serve, etc). also go to the windows control panel / programs and remove all toolbars or potentially unwanted software from there and run a full scan of your system with the security software that you have in place and different other tools like the free version of malwarebytes & adwcleaner.

Remove a toolbar that has taken over your Firefox search or home page Troubleshoot Firefox issues caused by malware

Mozilla would not link to a survey from such a place nor is it a link in Firefox browser.

I have this problem too... I found this Free Games Toolbar, so I disabled + uninstalled. Hopefully the problem's fixed. Thanks.

It was caused by a weird download manger. When you remove it and try to restart, it opens four or more windows. Don't panic: after closing all windows and restart of Firefox, everything was back to normal.