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How do I download /plugins.xpi for my camera?

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When I try to download the plugin for my Foscam Fi9821w camera, I get the message "plugin has not been verified". How do I solve this.

When I try to download the plugin for my Foscam Fi9821w camera, I get the message "plugin has not been verified". How do I solve this.

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Current Firefox releases require extensions to be signed to prevent abuse by malware. In Firefox 43 and later unsigned extensions will be disabled by default. You can set xpinstall.signatures.required to false to disable this security feature in the current Firefox releases. In later Firefox releases and Beta builds (47+) you may not be able to override this anymore.

See also:

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.