Thread:VisualEditor/Feedback/Tab doesn't even show up in Pale Moon, permanently loading (8+ hours) in Chrome and stock Firefox/reply (3)

Just to clarify, we currently have a very-restrictive whitelist of what browsers are known to work in VisualEditor (the "big four" of Chrome/Firefox/Safari/Internet Explorer - and the last of these was only added in the past month). Note in particular that forks of the big four browsers differ in the ways that we care about, so Pale Moon does not make it through the whitelist. Longer-term we will switch to using a blacklist for known-bad browsers, but we haven't had the opportunity to do this yet.

On the HTTP/HTTPS mixed-content issue, a fix for this has been made in Parsoid but is awaiting Parsoid achieving greater stability before we can deploy a newer version.