Thought this was pretty funny :)
http://www.codemeit.com/reviews/chrome-vs-ie-javascript-engine-performance-comparison.html
http://www.codemeit.com/reviews/chrome-vs-ie-javascript-engine-performance-comparison.html
That, plus compatibility issues among addons (one addon having an effect on another, etc...) is what I would call misbehaving addons.proners wrote"Some addons may cause memory leaks"