Avg safe search

How do I remove the AVG search from being the default search engine when I open a new tab in Fire Fox?  First time opening FF it is google (which I want), but if I click on another tab, it switches to AVG SAFE SEARCH as the default.  I've gone into settings a million times and reset to Google, but AVG keeps coming up.
Thanks!

Hello Lynda.
I am sorry that you ran into this issue.
To fix this, please check out this link http://support.avg.com/SupportArticleView?urlname=How-to-uninstall-AVG-Toolbar-homepage-and-Secure-Search-from-your-browser
Thank you.