Re-enable flash 10.3 in firefox 19.02

I need flash 10.3 for other software. 11 does not work for me. I know what the risks are and keep my computer clean. Firefox 19.02 decided for me I couldn't use flash 10.3.183. This breaks my other software. It not my fault Adobe screwed flash. How do I turn flash back on in firefox & seamonkey. If there is no option I will downgrade to earlier versions.

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