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Add-ons on a closed network without internet access how would that affect add -ons?

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How the validation is done, does it required internet access to validate? Some users will be in a closed environment without internet access.

How the validation is done, does it required internet access to validate? Some users will be in a closed environment without internet access.

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No, the new signing feature for add-ons doesn't need an internet connection to verify the extension. The "signature" is verified inside of Firefox.