resource packs into the Eaglercraft browser settings, or are you looking for anti-cheat
After testing six different "X Ray 1.8" packs across three different Eaglercraft builds, this is the only one that renders seamlessly without crashing the WebGL context.
Xray Ultimate 1.8.zip - Minecraft Resource Packs - CurseForge
Which of these are you interested in exploring next?
: Makes it easier to locate dungeons, strongholds, mineshafts, and player-made faction bases. 16x Resolution