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Wikipedia's FF Release history shows that FF4 and 5 are non-supported releases. Is that accurate?

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Question is simple - is FF4 and FF5 still supported releases. The Wikipedia chart shows that FF3.6 is supported, FF4 and FF5 are not, and FF6 and FF7Beta are supported. If my company is testing a new website, we are trying to determine which versions we should be testing.

Question is simple - is FF4 and FF5 still supported releases. The Wikipedia chart shows that FF3.6 is supported, FF4 and FF5 are not, and FF6 and FF7Beta are supported. If my company is testing a new website, we are trying to determine which versions we should be testing.

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With each new release the previous releases become unsupported.

There will be more releases this year: