Follow the below steps to revert back homepage & other browser setting:
This step is for Google Chrome users:
- Start Google Chrome browser and click the 3-Horizontal Bar icon present at the top right corner of the browser.
- Go to Settings → Search → Manage Search Engines
- Select the search provider that you want to make your default search provider and click on Make Default.
- Now exit from the browser and start it again to let the changes take effect.