If by tabs you mean one of the following:
The answer is no , navitabs is not listed on the cloud available add ons list and you can't create user macros in cloud.
One thing you could do is to raise a feature request at https://jira.atlassian.com asking for the navitabs plugin to be added on that list.
Yeah, the answer Iavitz has given us is actually the correct one.
If you want, you can alternatively let us hear what you would like Confluence to have with a little more details by creating a private ticket at https://support.atlassian.com so we can correctly address the improvement request for you.
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