Thank you for providing your detailed system information. It shows that you have multiple home pages set. This may not be obvious from the small amount that you can see in the Preferences dialog, but you have (URLs shortened for forum display):

• https://mail.google.com/...
• https://mail.google.com/...
• https://mail.google.com/...
• https://login.yahoo.com/...
• http://www.business.att.com/...
• https://www.google.com/search...

I suggest completely clearing out your home page setting, then saving your preferred page again. These article should help with that:

• Startup, home page, tabs, and download settings
• How to set the home page

Does that work?

By the way, are you using the Firefox Sync service to copy settings between different system or devices? There may be some additional steps in that case, to prevent the unwanted list of pages from getting "sync'd" back.

So...when I save a Home Page (use Current Page) that actually saves all open tabs. Wow. NEVER would've figured that one out. Thank you for the incredibly prompt reply with the fix. Very impressed and grateful.!

Glad to hear that fixed it.

It's probably too subtle: the button says "Use Current Pages", in other words, it's plural. Maybe some kind of confirmation is in order? Actually, displaying all the pages on separate rows in a list box for easy editing would be a good idea.

Best is to open a new window with only that tab if you want to use the "Use Current Page" (note that Firefox adds the 's' pages if more than one tab is open).
You should also be able to drag a tab or the "Site Identity Button" (globe/padlock) on the location bar on the toolbar Home button to set this tab as the home page (you need to confirm this).

Thanks you for the info!