This is a spinoff from the WONTFIXED bug https://bugzilla.mozilla.org/show_bug.cgi?id=582437 When you take a look at the new AMO Zamboni feed under https://preview.addons.mozilla.org/z/en-US/firefox/addon/1865/reviews/format:rss and go to View > Source you can find that there's no syntax highlighting at all in the view source window. It just shows plain text. Unfortunately, I haven't found other feeds that are served with rss+xml so I couldn't check further.
Probably duplicate of bug 344353
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 344353
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