FireFox 54.0 (32-bit) "Remote XUL" error when trying to view snapshots

FireFox just updated itself on my PC and now I'm getting errors when trying to view web page snapshots. Not sure where to report this as it's not an error that can be reported using "Report Errors"?

The error I get in the launched browser window is:

(i) Remote XUL

This page uses an unsupported technology that is no longer available by default in Firefox.

Please contact the website owners to inform them of this problem.
  • We'd still want to see a Report ID.

    What's an example snapshot URL? In the latest version of Zotero 4.0, all it does is load a file:// URL in Firefox.
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