Microsoft is testing a weird change to the Bing Search results user experience. Bing is testing that when you do a search from the home page, that it opens the search results in a new window, instead of loading those results on the same tab you are on. Bing is also testing opening a new window for when you click to the next page of the search results.
from Search Engine Roundtable https://ift.tt/QAWfJdp
