Why did firefox attempt to install some kind of computer improvement software

received message that there was a new browser version and the download was NOT an update to Firefox. It was some kind of computer cleaner/speeder upper and I caught and cancelled the INSTALL not UPDATE

Deceptive messages about downloads being Firefox updates can be generated by websites or by add-ons. If this was a one-time thing, it may have been an ad on a site you were visiting. If it occurs repeatedly, you probably need to check for a bad extension or malware.
Bad extensions often are installed externally to Firefox. I suggest starting here:
Open the Windows '''Control Panel''', Uninstall a Program. Click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. Take out as much trash as possible here.
Then, in Firefox, open the '''Add-ons page''' using either:
* Ctrl+Shift+a
* "3-bar" menu button (or Tools menu) > Add-ons
In the left column, click Extensions. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions.
Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.
Finally, you can "mop up" remaining issues with the scanning/cleaning tools listed in our support article: [[Troubleshoot Firefox issues caused by malware]].
Hopefully you can flush it.

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