hello, this may be an issue with malicious software already present on your system. please perform all these steps:

1. reset firefox (this will keep your bookmarks and passwords)
2. afterwards go to the firefox menu ≡ > addons > extensions and in case there are still extensions listed there, disable them.
3. finally run a full scan of your system with different security tools like the free version of malwarebytes and adwcleaner to make sure that adware isn't present in other places of your system as well.

Troubleshoot Firefox issues caused by malware

All ads cleared thank you. When opening Firefox under my profile (administator) it loads correctly. When opening it under another profile, it opens two tabs. One is the welcome page, the other the default google search. It does not save a custom home page. Please help