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Migrate from FF3.6 to FF4

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Is there something that will tell me what extensions that I'm currently using in FF3.6, that I might not need in FF4?

Is there something that will tell me what extensions that I'm currently using in FF3.6, that I might not need in FF4?

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That isn't quite what I was hoping for. I was looking for a table like the compatibility report, but with equivalent functionality as a percentage e.g.

All In One Sidebar - 10% . . Tab Scope - 80%