Yammer Time, the Firefox extension that reminds you to update your status on Yammer, has been updated to add support for authenticating via OAuth. You can install the update from Mozilla Add-ons.
OAuth is basically a way to allow applications (like Yammer Time) to act on your behalf (update your status) without having to disclose your password to the application. So it’s safer for you, since you don’t have to worry about malicious programmers stealing your usernames and passwords, since you never gave them out. After you upgrade to this version of Yammer (version 1.1), you’ll have to authorize Yammer Time once, but then you’ll never have to do it again.