Yesterday, FireFox 39.0 came by automatic update.
Now FireFox deploys fixes for the Logjam attack really. You can see what vulnerabilities are fixed in 39.0 ⇒ Fixed in Firefox 39.
As you know, they fix a lot of vulnerabilities in each version. So you must keep your web browser up-to-date status. Well, this is not for web browsers only (^^;).