Couple of months back I've switched to Android gesture navigation, but from the start missed this long-press back button feature. Bummer to now find out it doesn't work anymore with the regular Android navigation buttons.
The least should be to make it work from the Vivaldi menu back and forward buttons. But ideally also Android navigation button as well as long holding back gesture should work, if the latter is supported by Android in the first place.
Looking forward to some improvement on this!