See also: https://developer.mozilla.org/en-US/docs/CSS/transition
I will consider reviewing the CSS spec for it, but considering the gecko version used by documentation standards uses the -moz prefix, and application/engine version may (and regularly is) be checked by websites as a determining factor, removing the prefix would potentially break those sites (finding a 15.* browser, subsequently serving a dynamic page with -moz prefix, and transitions as a result not working).
Depending on release plans and what code base is going to be used for the next major version of Pale Moon, I may possibly add support for both syntaxes, but will not remove the -moz syntax support in 15.* because of the above.
No, actually, it doesn'tdark_moon wrote:But it works, even without the moz prefix, so this isn't a big problem