In case you see blank boxes in your Firefox, instead of Google FriendConnect (GFC) gadgets, you can try searching the configuration window of the HTTPS Everywhere add-on. For me, it was the GoogleServices option, which I had to deactivate in order to re-enable the GFC gadgets.
|HTTPS Everywhere Preferences window|
It took me some time and several deactivations and reactivations of my add-ons while trying to find the culprit and I found it.
Visit The Light of the LAMP blog for more…