Mozilla has had to release patches for 8 flaws, 3 of them critical, in versions 3.5 and 3.6 of the Firefox browser.
Mozilla gives a 'critical' rating to any flaw that attackers could exploit to run code and install software with no user interaction beyond simple browsing.
The three "moderate" vulnerabilities work in uncommon non-default configurations or require the user to perform complicated steps.
Mozilla is also set to release crash protection to Firefox version 3.6.4 which should ensure the browser stays running even when a plug-in application fails.
Mozilla has said that the results from initial tests show Firefox 3.6.4 does significantly reduce the number of crashes experienced by users watching online videos or playing games.
Mozilla's Christian Legnitto said: "When a plug-in crashes or freezes while using Firefox, users can enjoy uninterrupted browsing by simply refreshing the page,
"At this time, Firefox offers crash protection for Adobe Flash, Apple Quicktime and Microsoft Silverlight on Windows and Linux computers."
Firefox has assured users that support for other plug-ins and operating systems will become available in the near future.
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