Sigh. Once again, the browser is failing to clone some object, most likely a blob object, because it does not support the structured clone algorithm correctly. The link I posted to the structured clone algorithm on MDN is not "mangled" whatever that means.
As for where in the script the error is thrown, there is a detailed traceback in the error message. All they need to do is either
1) Reproduce the error themselves and click the error link in the JS console which will take them to the exact line the error is raised, but perhaps they also dont have a working JS console in Pale moon.
2) Lookup the line numbers in the traceback manually in the file resources/content-server/index-generated.html in the calibre installation directory.
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