I was wondering if this plugin could be installed some how in a server instance of Confluence - regardless there is a very similar plugin named 'Talk - Inline Comments'
Later versions of Confluence implement inline comments so you don't need it.
Before that was implemented, yes, you'd need an add-on to do it. But I'm not sure which add-on you're talking about when you say "confluence inline comments" - if it's the internal implementation, then you don't need to install it, it's off-the-shelf.
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