A Dublin professor has released a paper on web browser privacy. Edge is singled out for using hardware identifiers in requests and unnecessarily sharing entered URLs with Microsoft:

“From a privacy perspective Microsoft Edge and Yandex are qualitatively different from the other browsers studied. Both send persistent identifiers than can be used to link requests (and associated IP address/location) to back end servers. Edge also sends the hardware UUID of the device to Microsoft and Yandex similarly transmits a hashed hardware identifier to back end servers. As far as we can tell this behaviour cannot be disabled by users. In addition to the search auto-complete functionality that shares details of web pages visited, both transmit web page information to servers that appear unrelated to search auto-complete”