User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2.1) Gecko/20021130
You need to manage your images. It looks like you TreeLabelProvider just
keeps creating images each time it needs one. It should instead create
each kind of image only once and then return that same image each time
it is needed. Then when the TreeLabelProvider gets its dispose() called,
it should dispose of all of the images it created.