I'm having trouble getting all my searches not to use yahoo.com as my search engine in Firefox.

After changing settings in Preferences>Search to Google, Firefox still uses Yahoo when I open a new tab and use the main (largest) search box, which is outlined with the large red rectangle below. The smaller search box (marked with a smaller red rectangle) does however use Google. ![enter image description here](https://i.stack.imgur.com/3ZR6G.png).

I'm stuck searching for answers since I'm not sure what to call the large search box versus the smaller search box, and I'm not sure if it is normal that these two are acting differently.