Firefox 3.0.9 fixes several issues found in Firefox 3.0.8:

• 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. (bug 470578)
• Fixed an issue where, starting with Firefox 3.0.7, inline attachments on popular webmail services (like AOL and AIM) would not display. (bug 482659)
• Large forms would sometimes take a long time to submit. (bug 426991)
• In certain cases, new windows would not have proper focus. (bug 446568)
• See the Firefox 3.0.8 release notes for changes in previous releases.

See the complete list of bugs fixed.