Yahoo appears when I press the new tab now and continues to do so even if I change it back

I tried the subject: config and the removal of Yahoo / change in about: newtab - it works, but in about 30 minutes, it is for Yahoo. I checked add-ins and extensions, and the only thing I'm running is Norton. I even tried to go back to the original version of Firefox, in case Yahoo has uploaded a new modified version, and that seems to work, yesterday. But today, when I clicked on the new tab - Yahoo back again. Nothing to do, it seems made a difference - it's worse than a virus, as it seems to keep regenerating itself. Can anyone help please?

I have "think THAT"I could find a resolution. I included here for info to others.
Went to the control panel in Windows
Choose to uninstall a program
Clicking the column installed on everything in date order.
Noticed that at the same time I installed another piece of software a 2nd piece has been installed without my permission. It was called Hub a lot of results.
Selected many results Hub and uninstalled.
To do this, I noticed that it closed Firefox.
After uninstalling, I restarted the PC, just in case he left something in memory
Then once it restarts again, I uninstalled Firefox (tbh, I probably didn't need to do that, but wasn't any risk)
Rebooted again (probably no need to do)
Once the PC itself started, I installed a version of Firefox.

Now, fingers crossed, it worked. If it has, I'll come back here tomorrow and this will mark as resolved.

Tags: Firefox

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