I have am now using Internet Explorer instead of Mozilla Firefox and it's working ok so far, apart from one blip when the game wouldn't load. I will report back if there are any more problems.

Make words longer than 4 letters which will give you directional arrows - when used for another word, these will "shoot" the bubbles. Or make a 4-letter word to give you a crown which, when that letter is used again, will pop a bubble.