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Firefox updates so Flash starts erroring out again

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Recently, every time Firefox updates, Shockwave Flash keeps giving me an error message 'Shockwave Flash may be busy... etc.' - whatever you did to fix the problem with Firefox 21.0, please can you do it again? Thanks.

Recently, every time Firefox updates, Shockwave Flash keeps giving me an error message 'Shockwave Flash may be busy... etc.' - whatever you did to fix the problem with Firefox 21.0, please can you do it again? Thanks.

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Modified by Amit Kumar Thakur