Thank you for your question. I was able to add both of these domains from your cPanel using Firefox. When you add a domain, it checks the DNS to see where it is pointed, which can take some time to return a response.
That may have been what was causing the site to stop responding. We would need more information to provide a specific answer, such as what browser type and version you are using.
If you have any further questions, feel free to post them below, or contact live Tech Support.
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