Firefox 50 on both Android and desktop are showing the "A plugin is needed..." or "Flash is disabled" UIs on ronson.com as appropriate, but Aurora and Nightly are showing nothing but a blank view. Mozregression seems to have given me an unrelated range: >Last good revision: 6594e386f0189fcef2aad159103a2e8fe1963e0d >First bad revision: c7a5e02ed8f48197c6d0cdfee5122d472321d8c3 >Pushlog: >https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=6594e386f0189fcef2aad159103a2e8fe1963e0d&tochange=c7a5e02ed8f48197c6d0cdfee5122d472321d8c3 I'm not sure if it's a worthwhile hint, but the devtools are reporting a size for the <object> tag in Fx50, but no size (0x0) in Nightly.

This was removed intentionally in bug 1307445.