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Have tried your suggestions. Version 30.31 (without Lightning Design) allows me to change event colours using Calendar Tweaks. Don't know how to access 31.8 or 31.8.5 so cannot try these. I am able to change colours in events using all other Thunderbird themes except Australis 31.7.5. I think there is a bug within 31.7.5 that does not allow changes in colours of events - they always stay green! Thank you for your help.

Questa recensione riguarda una versione precedente (31.7.5) del componente aggiuntivo.  L’utente ha inserito altre recensioni su questo componente aggiuntivo.

Cloud:

https://onedrive.live.com/?cid=ac1c0df493833b9c&id=AC1C0DF493833B9C!125

or look here:

https://onedrive.live.com/?cid=AC1C0DF493833B9C&id=AC1C0DF493833B9C!119

click on the add-on theme version and now download started.

Add-on Theme with versions-number x.x.5 with Lightning-Design, Themes with number x.x nur Thunderbird - Design.