Java plugin is starting multiple times on firefox

Hi
I use firefox and i need to open several tabs to access the oracle forms (that uses the java plugin)... in the past i only had one java running for several tabs open, but now for each tab it starts a new java process, eating all free memory.
Was this change on firefox or something related with java update? i'm using jre7u40.
How can i put back the old behavior?

I created a new profile in firefox and it seems to resolve the issue, now the java plugin is shared between ~5 tabs

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Java plugin is starting multiple times on firefox

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