Firefox
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Half the point of asking questions in a public sub is so that everyone can benefit from the answers—which is impossible if you go deleting everything behind yourself once you've gotten yours.
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I don't know whether any errors would be recorded when Firefox tries and fails to generate the list. While viewing that window, you could open the Browser Console popup window (Ctrl+Shift+J), then click the List All Tabs button in the main window and see whether any error messages appear in the Browser Console in response.
Although i managed to fix the problem, I went back to test it and indeed it gave an error:
The fix is in the edit above.
I wasn't able to replicate the error by adding one or two m or n dashes to the document title. Based on this error message and the screenshot, and comparing how Firefox displays other tab titles when Multi-Account Containers is installed, I wonder if the problem tab was open in a container that had been deleted or had become corrupted in some manner so Firefox had retained the assigned container ID, but that container ID no longer matched any container. Opening the URL in a new tab most likely used a different container, working around the problem.
UPDATE
I filed a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1848877