From August 5th, 2015 to April 25th, 2018, 50% user give 5-star rating, 50% user give 4-star rating. for Mousetures chrome extension.
Have tested this extension with the new version of Vivaldi 1.15.1147.36 (Stable channel) (32-bit) It seems to have the same Tab non-switching problem as the other extensions with the latest version of Vivaldi, but it will be a promising extension to use once the bug with the latest Vivaldi is fixed.
Rocker gestures work perfectly, just like Smooth Gestures but free :)