How to change which opens a new tab when: automatic configuration does not work?

Hello
For some unknown reason, my new tab changed from google to a weird yahoo one today. I can't find how to restore it back even after I did google my homepage and default search engine. I checked online and saw that maybe I could fix things with the car: config but I can not even open. When I try a search engine opens. Any help would be appreciated.

^:
I use it on: on the home page and use a mozilla.cfg file to do this automatically for each Firefox profile and use this file in every version of Firefox, so it's always close at hand.

Tags: Firefox

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