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Hi,
I have checked the available online documentation on how to turn off deprecation notices but I could not find any references of this. The popup is caused by the Zoomify software and not this plugin. It’s basically a warning to not use the zToolbarBackgroundVisible anymore as it will be removed in a future version. And using this setting can cause errors in the webpage.
I would advise you to reach out to Zoomify and ask if this popup can be suppressed. If it is technically possible in Zoomify, I can create a setting that makes it possible to turn these popups off. Keep in mind however, that you will then receive no more warnings of deprecated settings and the software may stop to work properly because of this.
Regards,
Sander