With Win 10 Pro & Firefox 50.1.0 as default, DuckDuckGo as default search engine to be used also for Windows search, still get Bing search results from Windows
Here's example of results when searching "cabernet franc" in Windows search: https://www.bing.com/search?q=cabernet+france&form=WNSGPH&qs=SW&cvid=9e14ff26b2c44f56a1a247ac97688d0b&pq=cabernet+france&nclid=C7A0E81FF975E0D633C136AF6D5E73B0&ts=1482246693581&cc=US&setlang=en-US
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Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control>(Mac=<Command>)<Shift> A)
In the Add-ons Manager, on the left, select Extensions. Remove Bing Anything. Now do the same in the computers Programs Folder.
Windows: Start > Control Panel > Uninstall Programs. Mac: Open the "Applications" folder. Linux: Check your user manual.