hello, please install the search reset addon - it will revert the most common customizations those adware programs do in firefox back to the default: https://addons.mozilla.org/firefox/addon/searchreset/

in case this doesn't solve the issue please try this: go to firefox > help > troubleshooting information > profile folder - "show folder", then a new window will open up. in this window look out for a file named user.js (it might be used to overwrite your custom settings). in case it is present , delete or rename this file and restart firefox afterwards.

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

How to fix preferences that won't save

Thanks for your help. I've tried both those options and neither has worked. I downloaded the add-on and removed the user.js file. Any more ideas?

then also try to run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner.

Do any prefs come up if you search the about:config page via its own search bar?

• http://kb.mozillazine.org/about:config

See also:

• http://kb.mozillazine.org/Preferences_not_saved

This solved it - thanks very much indeed! Harry