HOW TO UNINSTALL JZIP TOOLBAR

I had the same problem but found the solution on an other site. Basically you have to do the following:
1. go to C:/Program Files/Windows jZip Toolbar
2. in the folder there is a uninstall file for the toolbar execute it
3. delete the folder (not necessary)
4. open FF and type in the adressbar "about:config"
5. say you will be careful
6. type jzip in the filter bar
7. reinitialize all the values with "jzip" that are shown
8. close FF and restart => no more jzip startup page