On Thursday, April 13, 2017 at 6:22:48 PM UTC-7, Xidorn Quan wrote:
> In bug 1337655 [1], I'm going to disable -moz-prefixed CSS gradient
> functions by default.

This didn't stick (back in 2017), because it broke some buttons on gmail (which 
was filed as https://bugzilla.mozilla.org/show_bug.cgi?id=1366526 ).  But that 
was later fixed on Google's end, and we didn't get any other reports of 
breakage, so I've just re-landed this.

So, consider this a resurrected "intent to un-ship" -moz-prefixed CSS gradient 
functions. :)

For now, I've only disabled them for EARLY_BETA_OR_EARLIER (i.e. Firefox 65 
nightly and first half of Firefox 65 beta period), to get some testing without 
affecting release builds.  But if we don't have any serious webcompat fallout, 
we can relax that restriction and disable them in release as well.

The full-disabling is tracked in 
https://bugzilla.mozilla.org/show_bug.cgi?id=1176496.

I'll quote the rest of xidorn's original intent-to-unship, for extra 
context/background:
> We would still have -webkit-prefixed version of those functions which is
> part of the Compat spec [2]. The assumption is that there wouldn't be
> too many pages which depend on -moz-prefixed ones without also having
> the -webkit-prefixed counterpart.
> 
> [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1337655
> [2] https://compat.spec.whatwg.org/#css-image-type
> 
> 
> - Xidorn
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