Firefox unable to load library JSON

[danielweck]

Works fine in Chrome and Safari (OSX), but fails in Firefox. I tried clearing the browser cache, to no avail.

XML Parsing Error: not well-formed
Location: https://readium.firebaseapp.com/?
Line Number 1, Column 1: readium.firebaseapp.com:1:1
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    tryParse EpubLibraryOPDS.js:271
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    tryParse EpubLibraryOPDS.js:274
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