If you are using Firefox 3.0.12 an update of Firefox 3.0.13 is available.Firefox 3.0.13 release fixed several security issues found in Firefox 3.0.12.

Firefox 3.0.12 users will be updated to Firefox 3.0.13 automatically if you enabled update,if not you can update by

1.Open Firefox and from help menu ,click “check for updates”.

2.Your Firefox version will be updated to Firefox 3.0.13.

You can update to  latest Firefox 3.5.2 by checking for updates form help menu  in Firefox 3.0.13.

For more details read Firefox 3.0.13 release notes

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