!!! Not supported by Firefox 57 (11/14/2017), currently unable to find any touch API's that are usable in Firefox 57 for Android, will update if I find the info needed to start updating.
Swipe right to left quickly with one finger to go to the next tab on your phone.
Swipe left to right quickly with one finger to go to the previous tab on your phone.
(Last changed: 11/16/2017)