While 1.5.2 is stable, 1.9 offers a vastly superior experience for players looking for the "modern" Minecraft feel.

Close unnecessary browser tabs, disable heavy browser extensions, or restart your browser before launching the game. Connection Failed on Servers

version) is a web-based version of Minecraft that can be played in a browser. While there is no single "official" launcher, most players use specific or hosted URLs to access the game. How to Access Eaglercraft 1.9