A couple of things to try:
1. Uninstall and re-install each add on.
2. If that's a no-go, backup your ~.mozilla folder, delete ~.mozilla, fire up FF, install the add-ons. I went through this procedure recently, because FF had been doing some strange things, and everything's peachy again.
Your bookmarks and settings will be preserved in the .mozillabak folder, so if #2 solves your issue, you can restore what you need.
I'm out of ideas if neither of these tips help.