[xF 2.3.0 RC2] RSS Feed not working

[Daveo16]

We tried to use the RSS feed link with dlvr.it and it says 'We can't find a working feed there' & 'We can't validate your feed: Content is an HTML Document, not an RSS/Atom feed'

Also, with Firefox, clicking the RSS Feed icon, downloads a file instead of opening the RSS feed in a new tab.
[xF 2.3.0 RC2] RSS Feed not working

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