Tentatively blocking on Bug 1465457, although it sounds like there could be a workaround for reftests to enable -moz-binding there.

We probably do need to turn this off in all tests, there are even -moz-binding: being set in inline styles.

https://searchfox.org/mozilla-central/search?q=style%3D%22-moz-binding&case=false&regexp=false&path=

Hmm, yeah, that's right... That's unfortunate, but probably not worth to rewrite tests.

But enable it in all tests because a lot of them rely on using it in the
style="" attribute for example, or in inline stylesheets, which will no longer
parse this (even in chrome documents), and we don't want to rewrite all the XUL
and XBL tests.

https://hg.mozilla.org/mozilla-central/rev/b866f7486b8f

Note to MDN writers: I've added a note about this to the 67 rel notes: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/67#CSS

In terms of other things, might need to just update BCD.

I have finished off the documentation of this by updating the compat data: https://github.com/mdn/browser-compat-data/pull/4092

Posted site compatibility note: https://www.fxsitecompat.com/en-CA/docs/2019/moz-binding-css-property-has-been-removed/