keeps becoming default search

Hi All, has become my default search engine both on the top right search bar in firefox as well as the address bar search.

I know how to remove it from both of these (i.e. typing about:config) and resetting them to Google. However, every time I do this and restart Firefox it gets reset to

Does anyone have any idea how to stop removing it from defaulting to this? I only have the SEOBook toolbar installed.

This is surely strange. If you only have the SEO toolbar, the only thing I can think of is that there must be something in the configuration of the toolbar that makes FF to go back to Have you looked into SEO toolbar’s options?