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The "Do this automatically for files like this from now on" option is always unavailable

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Please, can anyone in the world tell me, how to add and edit mime types??? I want to download files without any confirmations. Why is the "Do this automatically for files like this from now on" option always unavailable???

This happened

Every time Firefox opened

== I want to download certain files

Please, can anyone in the world tell me, how to add and edit mime types??? I want to download files without any confirmations. Why is the "Do this automatically for files like this from now on" option always unavailable??? == This happened == Every time Firefox opened == I want to download certain files

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