permanently remove bing
I have Bing removed from my search engines and when I call up a new window Bing is not there, YAY. But if an app creates a window, even Thunderbird, the window has Bing as it default search engine and is back in the list of search options. This must be a default within Firefox itself or some data file where this comes from. How can I permanently remove Bing.
Addition information, if I lose all my open windows during a crash, last happened when I updated my bios it also reverts to Bing.