hello 1jazzguy, 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 do a full scan of your system with the security software that you have in place and/or a different tool like the free version of malwarebytes.

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

Thanks, Madperson. Found it in Extensions, and removed it. I'll have to restart Firefox to see if that worked, as I just checked a Wiki page, and it's still there. Will update.

Restarted, and so far, so good. Hope it doesn't reinstall itself. :) Much appreciated, and good answers.