My firefox browser keeps loading "my websearch" even though I have uninstalled it, and removed it from my programs. I have changed firefox to the default browser, but every time I log on it goes to "my web search"

"my web search" opens for a search engine. I don't want it. I have removed it from my programs. I have used their uninstall. I have made firefox my default browser. It keeps changing back to "my web search". how do I get rid of this? == This happened == Every time Firefox opened