Security updates in FF 2.0.0.13 introduced stability problems in the JavaScript engine. This is known to have caused sporadic crashes during JavaScript garbage collection. Some of these crashes showed evidence of memory corruption under certain circumstances and you can only presume that with enough effort at least some of these could be exploited to run arbitrary code.
The latest version, Firefox 2.0.0.14 (released yesterday), eliminates the instability problems. In case your auto-update hasn’t done so all ready I strongly suggest you update Firefox immediately.
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