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The recent change to 3.2.5 seems to have prevented me using PageUp and PageDown keys to scroll through a message.
Also, the Delete key no longer deletes the current message.

If I disable this add-on those keys work.

This is on Linux with TB 91.8.0

Questa recensione riguarda una versione precedente (3.2.5) del componente aggiuntivo. 

I can't confirm this issue. When the focus is in the preview pane, I can use the keys for up, down. pageUp, pageDown and Delete.

Please open a Thread in the support forum (English or German):
https://www.thunderbird-mail.de/forum/board/88-quote-colors-collapse/

Which was your previous addon version?