This is a gray area.
The browser version wasn't just a stripped-down shell; it was a fully functional game client. eaglercraft 1.7.2
The community has taken over, creating launchers with custom resource packs, shader-like effects (Post-Processing), and even voice chat plugins that run inside the browser. This is a gray area
Massive additions including the Savanna, Roofed Forest, Birch Forest, Flower Forest, Taiga (without snow), and the Mega Taiga (Giant Tree Taiga). creating launchers with custom resource packs