I also have Safari 10.0.2 also (full version is 10.0.2 (12602.3.12.0.1). That hasn't changed since 10.12.1 so I assume that this "feature" is due to the Sierra update.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365