If you uncheck "Accept third-party cookies", Firefox will no longer send any cookies to iframes (even if set outside of an iframe), which breaks the FriendFeed Facebook app. Has Firefox always been like this?
You can now get a daily or weekly email digest for anybody's feed on FriendFeed. You'll get a daily or weekly email with the most popular posts from that person's feed. To get the email, click the "Email/IM" link at the top of anyone's feed, and select the "Best of day" or "Best of week" email option.
This morning we changed the format of FriendFeed subscription email messages to include more information about people who subscribe to you. Please let us know if you see any problems, and keep an eye out for more email improvements in the future.