When I select Box as a service for outgoing attachments i get a XML Parsing Error in Thunderbird Daily 68.0a1 (2019-04-20) (32-bit) on Windows 7.

XML Parsing Error: undefined entity Location: chrome://messenger/content/cloudfile/Box/management.xhtml?accountId=account3 Line Number 25, Column 61:
<a href="http://www.box.com/static/html/privacy.html">&cloudfileMgmt.privacyPolicy;</a>
------------------------------------------------------------^

Found the regression, although I'm not sure that anything will be done about it given that this document is going to be removed from the tree in bug 1531595.

You can test this regression by flipping the pref dom.prototype_document_cache.enabled.

So our stuff break if they remove a page? http://www.box.com/static/html/privacy.html seems to be redirected. Anyway, as long as we fix it in some way, shape or form, we're OK.

No our stuff breaks because they did … something. It's us that are going to remove the page.

Sorry, I see how talking about two different bugs in one sentence is confusing.

Not sure if there's anything to do here since we removed Box now on trunk.

Yes, no Box.com left in TB, use: https://addons.thunderbird.net/en-GB/thunderbird/addon/filelink-provider-for-box/?src=ss