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

AnonymousUser

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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