I have a strange problem. I installed flash and video download add-on for my firefox browser and I see a bunch of icons in my navigation toolbar. I am not able to remove those bunch of icons by customize option. I disabled the add-on and finally uninstalled it completely, but still I have the bunch of icons placed in my navigation bar. I have a screenshot of it as below.

Any suggestions on how to get it removed is appreciated.

I have Ubuntu 11.10 and Firefox 7.0.1