That IS strange. We just moved the toolbar to a production folder and perhaps the version you had got confused. My suggest is to uninstall the previous version then go back to the web site and download and install the FF version (you pick Firefox now when downloading).
http://www.whatbird.com/wingedexplorer/downloadtoolbar.aspx
Even tho it will appear to be the same its not, the update comes from a different folder. I think this will correct the problem. In the future when you do an update you don't need to uninstall the previous version, that will be done automatically.
iBird Explorer: Finally a field guide as light as a feather. See it at http://www.ibird.com