A reader, Joshua Hedlund, emailed us a screen shot of this test. Bing has confirmed this is not a browser extension modifying the search results, but rather one of Bing’s many tests to the search results user interface.
Here is a screen shot of Bing with favicons in the search results:
I am personally unable to replicate this but a Microsoft spokesperson told us:
We’re constantly updating and refining the Bing search experience, and before any changes are implemented they undergo intensive testing and experimentation to ensure the best possible user experience. We have nothing further to share at this time.
For more on Bing’s user interface changes, click here.