What To Do About A "Busy Script" Message In Thunderbird?

My partner runs thunderbird v52.7.0 and he keeps getting an error: "A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: chrome://global/content/bindings/browser.xml:237"

He doesn't have chrome installed. How can I troubleshoot this? Thanks!
mel200Asked:
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Dave BaldwinFixer of ProblemsCommented:
That means he is getting emails with active content, probably javascript, in them.  'chrome' in this case is not the browser from Google but the internal structure of the application.  Firefox and Seamonkey use the same 'chrome' ideas.

I would click on Stop.  I never get emails like that.
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mel200Author Commented:
Right, he does that, but it happens multiple times a day. He does get a lot of email though.
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mel200Author Commented:
Just got more information. He says it also happens on his browser, which is Firefox.
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mel200Author Commented:
I've asked him to pay more attention as to when it happens, if there's an email coming in, if so who from, if not, what web page is he on. That sort of thing. I'd like to leave this question open for a bit.
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Dave BaldwinFixer of ProblemsCommented:
Yes, he needs to know where it is coming from.  Most of us don't see that because we don't go to places that cause that...
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mel200Author Commented:
ok, it happened a few minutes ago. He had Thunderbird open, and he was browsing a page on Amazon. Emails started to come in, and the error popped up, freezing his email client.

I looked through the emails that came in, and one had a javascript error. It had an embedded youtube video.

 I see on this thread: https://www.ghacks.net/2010/06/30/thunderbird-3-javascript-whats-the-deal/  that thunderbird no longer even supports javascript, so why would I be getting a javascript error? So confusing.  For one thing, what is thunderbird 3? I only see a version number.
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Dave BaldwinFixer of ProblemsCommented:
Thunderbird 3 is a very old version and that thread is from 2010.  I think he is just being spammed.  Or he already has malware on his machine.  There is no connection between Thunderbird and Amazon.  Look at the source for the emails and create message rules to block and delete them.
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mel200Author Commented:
Thanks, he is only working with either Thunderbird or Firefox, keeping one closed while he works on the other, and hasn't run into this issue again.
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