https://kubernetes.io/docs/concepts/cluster-administration/addons/
Installing Addons | Kubernetes
Note: This section links to third party projects that provide functionality required by Kubernetes. The Kubernetes project authors aren't responsible for these...
installing addonskubernetes
https://ptrcnull.me/posts/firefox-stable-unsigned-addons.html
Installing unsigned addons in Firefox stable
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installingunsignedaddonsfirefoxstable