After a recent update I have 'My Search' and I want to uninstall and revert to original settings, how can I do this?

When I select one of my bookmarks or search (Google) the tab opens to a Yahoo search engine page.

I've uninstalled 'My Search' but when I attempt to reset the settings by typing 'about.config in the address bar I also get the Yahoo search page.

The version of Firefox is 23.0.1 (apparently up to date)

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