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Where can I find previous versions of Firefox for testing

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We develop web based training and need to be able to test for compatibility with older versions of Firefox. Where can we download an official copies of each version?

We develop web based training and need to be able to test for compatibility with older versions of Firefox. Where can we download an official copies of each version?

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Isisombululo Esikhethiwe

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this makes no sense at all!

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When you are developing web apps and need to support multiple browser platforms you must be able to test even previous versions. Not everyone upgrades immediately with each new release of software, especially corporations.