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I need to add Belgium eID PKCS#11 module for install a electronic eid cart reader but I get the error message Unable to add module

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OS Mac high sierra version 10.13.5

OS Mac high sierra version 10.13.5

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Where are you downloading Firefox from ?

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Hi, I'm downloading Firefox from www.mozilla.org.

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Did this work previously for you with Firefox?

Do you have the extension installed?