Clear Cookies & Cache

• https://support.mozilla.com/en-US/kb/Template:clearCookiesCache

Clear the Network Cache

• https://support.mozilla.com/en-US/kb/How%20to%20clear%20the%20cache#w_clear-the-cache

Troubleshooting extensions and themes

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes

Check and tell if its working.

Are you taking about a search from the search container on the default Firefox homepage - about:home?

Yes, from the default firefox homepage - google

gb4242 Were you able to resolve your problem using the links mentioned in my previous reply ??

These steps worked for me. Thanks, mha007.

Yes, at last it is gone!