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after the last update clicking the thunderbird icon produces an errormessage "XML Verbarbeitungsfehler Not defined identity

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After the last update in the night 11-12 Nov I can not access thunderbird on my Windows 10 acer 3 laptop: clicking on the thunderbird icon I get an error message in German errormessage bei Thunderbird XML-Verarbeitungsfehler: Nicht definierte Entität Adresse: chrome://messenger/content/messenger.xhtml Zeile Nr. 903, Spalte 3:

 <key id="openLightningKey"
</pre>

--^ What can I do?

After the last update in the night 11-12 Nov I can not access thunderbird on my Windows 10 acer 3 laptop: clicking on the thunderbird icon I get an error message in German errormessage bei Thunderbird XML-Verarbeitungsfehler: Nicht definierte Entität Adresse: chrome://messenger/content/messenger.xhtml Zeile Nr. 903, Spalte 3: <key id="openLightningKey" --^ What can I do?

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