Firefox gives me the insecure content on a secure page error when using https://www.newsblur.com/

While I know I’m going to get that if the feed content contains HTTP images etc, this happens when I load the newsblur front page, which doesn’t contain any third-party material (or at least, I can’t see any!).

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appears to be favicons in the feeds and also profile pics for the twimg link in the upper left.