On firefox, the version I'm using is still 3.3.4, which is the version available from the mozilla addon store: https://addons.mozilla.org/en-US/firefox/addon/lastpass-pass...
Why the discrepancy? Am I still vulnerable? In their blog post, they even note:
We want to thank our partners at Apple, Google, Microsoft, Mozilla, Opera, Yandex and others who fast-tracked our extension review and release.