Remove pre-2013 vendor-prefixed -moz- CSS properties
Summary:
Per https://caniuse.com/ and MDN,
* `-moz-opacity` superseded by unprefixed `opacity` supported since Firefox 2 released 10/2006
* `-moz-border-radius` superseded by unprefixed `border-radius` supported since Firefox 4 released 03/2011
* `-moz-box-shadow` superseded by unprefixed `box-shadow` supported since Firefox 4 released 03/2011
* `-moz-animation` superseded by unprefixed `animation` supported since Firefox 16 released 08/2012
* `-moz-backface-visibility` superseded by unprefixed `backface-visibility` supported since Firefox 16 released 08/2012
* `@-moz-keyframes` superseded by unprefixed `@keyframes` supported since Firefox 16 released 08/2012
* `-moz-transform` superseded by unprefixed `transform` supported since Firefox 16 released 08/2012
Test Plan: None. Probably installing old browser versions if you don't trust documentation.
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25915