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Having successfully installed Adobe Flash 11.3 when using Safari on my iMac and downloaded Firefox 21, why still the "plugin has crashed" message on Firefox?

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If my only solution is to downgrade to Flash 10.3 on Firefox by uninstalling Flash 11.3, will I lose the latter with its benefits when using Safari?

My operating system is Mac OS X 10.7.5 (Lion)

If my only solution is to downgrade to Flash 10.3 on Firefox by uninstalling Flash 11.3, will I lose the latter with its benefits when using Safari? My operating system is Mac OS X 10.7.5 (Lion)

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Flash updated yesterday, so please update your flash and check it out..