This was fixed for me in November 2017 when Async Pan/Zoom (APZ) was implemented: https://hacks.mozilla.org/2017/11/async-panzoom-apz-lands-in-firefox-quantum/

This was fixed for me in November 2017 when Async Pan/Zoom (APZ) was implemented: https://hacks.mozilla.org/2017/11/async-panzoom-apz-lands-in-firefox-quantum/ https://hacks.mozilla.org/2017/11/async-panzoom-apz-lands-in... Also, Firefox 79+ on Android (August 2020) performs significantly better than older versions, despite having lost many features in the rewrite. The current version might meet your expectations.