There’s a lot to like about Google+, but if you’ve spent a lot of time on Facebook it’s a pain to change networks. So it’s nice to know you can mash them both together.
You’ll need to install the Start Google Plus extension:
Firefox: Start Google Plus
This not only allows you to post to both networks simultaneously, but will squeeze all your FB content into your G+ page. There are some other extensions that will add Facebook as a separate tab, but this one can seamlessly weave both sites together. Nice.