Firefox 3.0.9 is now out with quite a few security fixes and improvements. To update, go to Help -> Check for Updates or grab it from http://www.mozilla-europe.org/en/firefox/

Here is the list of changes:

• Fixed several security issues.
• Fixed several stability issues.
• Many users experienced an issue where a corrupt local database caused Firefox to “lose” its stored cookies.
• Fixed an issue where, starting with Firefox 3.0.7, inline image attachments on popular webmail services (like AOL and AIM) would not display.
• Large forms would sometimes take a long time to submit.
• In certain cases, new windows would not have proper focus.