Why does my search engine automatically change to yahoo?

[Sigve]

I have Firefox, and i want Google as my search engine. Everytime i try to change it to Google, i reopen Firefox, and it is yahoo again. What to ddooo

[Steven]

Do you have yahoo toolbar installed? If not, reinstall firefox.

[kamala]

Yep it should be some plugin just uninstall it your good to goo

[Way2Vin]

Follow below steps:
1. On firefox address box type "about:config"
2. Click "I'll be careful - I promise"
3. search for "browser.search.defaultenginename"
4. right click and select "Modify" or double click it.
5. paste the google search link into the dialog box "https://google.com/#q="
6. restart firefox.

if that didn't work reset the firefox preferences from Help > Troubleshooting Information, then click "Reset Firefox"