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How can I import personal certificates into firefox that are not pkcs12 files (.cer or other)?

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I am trying to import .cer personal certificat into mozzila so I can go to an secure site (bank account online) but cannot do it since it is not pkcs12 type of file. Can you help me.

I am trying to import .cer personal certificat into mozzila so I can go to an secure site (bank account online) but cannot do it since it is not pkcs12 type of file. Can you help me.

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If you can import the certificate files in IE then try to export them in IE to a base64 cer or other supported format.

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I tied that, but when I try to import them to mozzila all it wants are pkcs12 files. It does not accept any other.