I am using FF 3.6.18 on XP, Vista, and Win7. Since FF updated itself to 3.6.18, I'm missing all kinds of addon icons. Needless to say, most addons can't work unless the icon there to click. When I went to the toolbar customize window to drag them back out, I find ALL of my addon icons missing. The default FF icons are there, but all of the addon icons are missing. I have seen lots of posts from people with the same problem running FF4, but it is not a problem only with version 4. Most of the replies given advise going to the customize window and dragging the icons back out - obviously written by people who weren't reading the questions very carefully. Others recommend clicking the restore default icons button. They haven't read the question very carefully either. I have this problem on all my PCs, those running XP, Vista, and 7. Yes, I have already run virus and spyware checkers, and that didn't help any of my PCs. Since the problem is on all my PCs of various OSs, and upgrading to FF4 only seems to make things worse, it seems like a FF bug. If it is a known bug, why doesn't Mozilla say so so users don't have to waste time trying to fix it. Or is it fixable? Does anyone know how to troubleshoot this?