That is not a valid epub link. You do not need nor should you use javascript or onclick for hyperlinks in xhtml.
Replace the:
<a href="blah" ... >
blah part with the correct link to a local xhtml file inside the epub the corresponds to what gets popped up on the website when you click on that footnote (most likely ... an element with an id of d0e2555 inside the xhtml file that represents the ft8g5008n9 document).
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