Mozilla, the company which owns and distributes Firefox, has released a patch that addresses a javascript vulnerability in Firefox 2.0 & 1.5. This update addresses that security issue and is availble for both the Mac and Windows versions of FireFox.
Following recent updates, Mozilla discovered that disabling the javascript feature in the web browser could be circumvented by specially crafted image file tags.
Click here to download the latest patch for your version of Firefox.