According to Microsoft's privacy statement:
To enable Cortana to provide personalized experiences and relevant suggestions, Microsoft collects and uses various types of data, such as your device location, data from your calendar, the apps you use, data from your emails and text messages, who you call, your contacts and how often you interact with them on your device. Cortana also learns about you by collecting data about how you use your device and other Microsoft services, such as your music, alarm settings, whether the lock screen is on, what you view and purchase, your browse and Bing search history, and more.
A lot of the things listed are pretty intrusive, but I want to focus on the bold last part. The privacy statement explicitly says Cortana tracks your browsing but is pretty vague on the details.
Does Cortana track your browsing live, or just scan the history? Does it track my browsing only if I use IE/Edge? Or does it track me when using Firefox/Chrome too? What if I use private/incognito browsing modes? Does it still track me?
Even if I used the Tor browser, there's no technical reason Cortana couldn't still track me. Does it?