This sounds like you are looking for information on a specifically updated version of the Tuff Client for Eaglercraft 1.12.2
Enable WebGL and allow storage (IndexedDB) for saving settings. tuff client eaglercraft 112 2 updated
Some of the notable features of Tuff Client Eaglercraft 1.12.2 include: This sounds like you are looking for information
However, if you intend to play fairly on competitive public servers, consider using only cosmetic modules or sticking to vanilla. Cheating ruins the experience for others. tuff client eaglercraft 112 2 updated
Users have reported specific technical hurdles with recent updates:
Strong, especially using the Ampler Launcher or WASM versions, though some users find it heavier than vanilla 1.8.8.