Bit confused about this. Are you saying you have this error and would like some help (but it is not caused by the plugin). Or that using the plugin causes a mixed content error?
Thanks for the relpy. The former; the script is only available from lab.maltewassermann.com via http.
I tried copying the script to my server and replacing the source URL via the responsible_bookmarklet filter which got a step closer but the script tries to load jQuery from a CDN via http so I got another mixed content error.
I’m coming to the conclusion that I need to fork the script to skip jQuery; unfortunately, I can only find the minified version.
This will be tricky to do with the JS being served externally like this. I think a fork would be the only option, then hosting the assets locally.
Also this features has been in the customizer since 4.5 I think: https://core.trac.wordpress.org/ticket/31195
True, but the script offers more options, including orientation. Thanks for your help.