To replicate, go to https://m.mediawiki.org - with console open, you should see an error like:
[blocked] The page at https://m.mediawiki.org/wiki/MediaWiki ran insecure content from http://meta.m.wikimedia.org/wiki/Special:BannerRandom?uselang=en&sitename=M…roject=wikimedia&anonymous=false&bucket=1&country=US&device=android&slot=6.
I presume this makes it impossible to run CN banners on mobile devices for logged in users.
I chatted briefly with Matt Walker about this and it sounds like this is the result of how infrastructure is currently architected, though there may be an easy solution of forcing mobile URLs in CentralNotice using MobileContext::getMobileUrl() from MobileFrontend.
Version: master
Severity: normal