hello, 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.
finally, run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner.

Remove a toolbar that has taken over your Firefox search or home page

thanks for the help. i did go into the add ons and i was able to disable it. very annoying how they place things you do not want on your homepage when update

yes this was probably a scam tactic that is trying to trick you into installing this unwanted toolbar!
please only download firefox from its official location at mozilla.org - in addition updates are handled internally by firefox so if any site suggests you'll have to download and run a .exe file in order to update, that will be fake (you can always initiate a check for updates manually in firefox > help > about firefox).

Yes no version of Firefox for any OS from mozilla org comes with the Yahoo toolbar.

Either you may have installed the Firefox version from https://downloads.yahoo.com/firefox or a software added the toolbar during a install for example.