It's not a worm from an information security standpoint It's the name of a java kit for playing media. I have had the error on IE and Firefox to the point where it locks up my browser. Here is a fix that worked for me:

1. Clear you cache
2. When you login, you may receive an error initially, turn off music and sounds using the upper right menu around the map

For me, the error was resulting from the MP3 playing of music and/or sounds. It has solved my problem. Maybe this will make your experience less enjoyable by not having the sounds but it may make it more enjoyable by being able to play the game.