From ComputerWorld:
Microsoft on Thursday began blocking rival browsers and search providers from using Windows 10's Cortana search box, the operating system's prime search real estate.
While Gavin didn't name names, Mozilla's Firefox modified Windows 10 so that when that browser was made the operating system's default, Firefox's selected search provider generated results from in-Cortana queries, with the ensuing pages appearing in Firefox, not Edge. Other browsers, such as Google's Chrome, did not go that far, but third-party extensions available in the Chrome Web Store did.
(Score: 0) by Anonymous Coward on Saturday April 30 2016, @04:20AM
Not to mention the privacy invasion and wasted bandwidth as Microsoft uses Cortana to submit your searches back to the mothership. Alas, Cortana appear to be this generation's IE in terms of something that should be removable but, as implemented, doing so manually will break other things for no good reason.